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feat: implement portable outbound HTTP and request lifecycle contracts - #275

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@aram356 aram356 commented Jun 8, 2026 •

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Summary

Implements the portable outbound HTTP and request-lifecycle contracts across core and the Axum, Cloudflare, Fastly, and Spin adapters.

  • Adds buffered and streamed outbound requests/responses plus a hard-cut, completion-driven batch API: start_batch_until, indexed next, explicit cancel, ordered collect, and the send_all_until convenience path.
  • Clarifies that start_batch_until takes an observation cutoff: reaching it stops observation even when individual slots retain budget, while earlier cutoffs remain a supported partial-result operation.
  • Replaces the memory-only adapter seam with typed PlatformMetadata facts for memory ceilings, live inbound request population, and host-ingress accounting, preserving source and explicit unknown reasons.
  • Adds checked, scope-aware memory-envelope validation with Fits, Exceeds, and typed Indeterminate outcomes; publishes canonical Axum, Cloudflare, Fastly, generic Spin, and Akamai Functions profiles.
  • Hard-cuts retired platform-memory APIs, updates the demo and generator, and records exact signature migrations in the unreleased changelog.
  • Makes batch termination explicit as Completed or Cutoff. Only Cutoff permits unresolved slots in a successful result. Explicit adapter failure, premature driver EOF, and duplicate or out-of-range indices return OutboundBatchFailure, preserving the precise error and every terminal slot collected before failure.
  • Preserves per-slot elapsed time and failure provenance. A batch cutoff keeps completed slots and leaves unresolved slots explicit instead of converting them into request timeouts.
  • Adds explicit cache-bypass and wire-authority policies. URI routing, SNI, and certificate identity remain independent where the provider supports that separation.
  • Enforces independent encoded-transport, decoded-output, and final-buffer limits; header count/byte limits; Brotli window and decoder-state policy; opt-in response rechunking; and typed timeout, transport, protocol, and content-coding failures.
  • Uses fixed category-only public error messages so provider diagnostics, URLs, and credentials cannot become wire-visible.
  • Carries one application-owned monotonic clock through ingress, outbound dispatch and deferred streams, returned response drains, configuration extraction, and response egress. MonotonicClock::deadline_after anchors relative cutoffs to that clock. Equality expiry wins and backwards time fails closed.
  • Adds route-aware ingress admission on every standard adapter, stable route metadata, request-start-relative deadlines, opaque request-owned grants, and bounded 404/405 fallback reads with application-selected overflow/timeout responses.
  • Gives every response-producing admission decision one non-clone ResponseEgressCompletion, transferred directly through PreparedIngress, ResponseEgressEnvelope, and the sole ResponseEgressAttempt. Terminal state is stored before the response-scoped completion and global observer run, each exactly once and behind independent panic boundaries. No response-extension carrier or envelope extraction bypass remains.
  • Adds deterministic ResponseEgressCompletion::join composition so independent response-owned resources share one exactly-once terminal report, and hard-cuts detached normalized errors to Send { completion, deadline } | Abort with request-start-relative bounded deadlines.
  • Adds explicit non-response AdmissionDecision::Abort. Axum closes the owned HTTP/1 connection before body polling; Cloudflare, Fastly, and Spin return a fixed provider error at their strongest available pre-response boundary and remain conservatively classified BestEffort.
  • Hard-cuts application assembly to fallible Hooks::configure plus core-owned App::build::<A>(platform). Successful hooks must preserve the complete adapter-selected metadata; core rejects changed facts instead of restoring them. Typed configuration failures propagate unchanged and stop serving before request handling. The generated scaffold keeps finite ingress policy with core-owned empty lifecycle tokens; the checked-in demo retains the full application-owned resource-composition example.
  • Implements adapter-owned response delivery through each platform's strongest boundary: Hyper connection ownership on Axum, a Workers writer plus AbortController, Fastly's low-level stream_to_client, and Spin's WASI response/body/result writers.
  • Adds a closed Fastly lifecycle runner that keeps request conversion, routed execution, response finalization, framing, streaming, and platform delivery under adapter ownership.
  • Uses Fastly pending-handle selection with index reassociation while retaining documented sequential dispatch, bounded selection-group, synchronous selected-body-drain, and cancellation limitations.
  • Preserves duplicate response fields, canonical host authority, bodyless response framing, strict content-length validation, hop-by-hop stripping, and source release on every terminal path.
  • Hard-cuts superseded APIs and configuration error variants. The checked-in demo, generated applications, templates, guides, capability matrices, CI sentinels, and legacy guards use only the current contracts.

Current Checkpoint: Bounded Synthesized Headers

Added in d47c8026:

  • Immutable app-level and validated Fastly per-request response-header sets, bounded to 32 values and 4096 serialized field-section bytes. Preserve canonical field precedence, ordered repeated values, typed overflow retry suppression, completion ownership and fallback budgets.
  • Cover normalized ingress errors, admitted source errors, canonical 404/405 and adapter fallbacks; do not decorate matched application responses/errors, admission refusals or failed application assembly.
  • Align the demo, generated application, specifications, implementation plans and changelog.
  • Local verification: all five required Rust gates, 2,193 workspace tests, 99 fixture tests, strict provider-target Clippy and documentation checks pass.
  • Actual local runtime evidence: 55 header wire cases, 40 assembly wire exchanges and one Axum pre-listener startup control pass. HEAD payload absence requires clean EOF; Fastly reports are request-correlated, and failed state release is observed before retry.
  • Evidence: header matrix, assembly and repeated header matrix.

This checkpoint is not completion of the broader adoption plan or hosted qualification. The full head-first/eager/redirect migration, Fastly's failed G2 preserving-read proof, all nine failed Fastly framing SDK parity controls, Cloudflare overflow recovery, consumer integration and exact-candidate hosted qualification remain open. No capability is promoted, no compatibility layer is restored, and the PR remains draft.

Reviewer correctness follow-up

Addressed R1–R4 in 92111839:

  • Axum validates exact-length source EOF before handing Hyper the final frame, validates transmitted zero-length streams before handoff under the original deadline, and preserves detached fallback payloads with HEAD suppression.
  • Batch completion requires clean driver EOF; trailing failures and malformed events are checked even after the last item or with zero slots. Collected slots survive driver failure.
  • Application assembly rejects changed platform metadata after successful configuration while preserving hook-error precedence.
  • Added regression coverage and aligned specs, implementation plans, guides, changelog, and the docs checker. Local workspace tests (720 core unit tests), strict native/WASM clippy, explicit adapter contracts, and demo/docs checks pass. Local WASM results are compilation/lint evidence; hosted lifecycle qualification requires separate deployed runtime artifacts.

Main merge and shared-policy follow-up

Addressed R5 and R6 in 91f4af38, merging main 683202c6 without restoring superseded APIs:

  • Axum, Cloudflare, and Spin share OutboundBatch::from_futures; adapters retain preflight validation, exchange ownership, clocks, and terminal samples. Ready results remain retained, driver EOF/index invariants remain enforced, and cutoff releases pending futures before reporting termination. Fastly retains its distinct provider-handle driver.
  • All four adapters share ResponseBodyPolicy and apply_response_body_policy, preserving declared-length checks, encoded limits, decoding/header rewriting, decoded limits, passthrough, and rechunk order. Transport reads, bodyless handling, deadlines, cancellation, and final buffering remain adapter-owned.
  • Main's opt-in reusable application lifecycles now use fallible assembly, fresh request registries, canonical admission, and lazy owned egress. Fastly custom callbacks return terminal Result<(), E> through a wrapper that prevents SDK-generated second responses.
  • Migrated the reusable fixtures to the current SDK pins and hard-cut APIs; expanded the legacy guard and CI coverage. Updated the outbound specification, lifecycle specification, implementation plans, guides, and changelog.
  • Local verification passes: full workspace tests (733 core unit tests), strict native/provider-WASM Clippy, Cloudflare/Fastly/Spin runtime contract suites, reusable fixture tests (5 core and 26 harness), Fastly fixture finalization and Viceroy 0.21.0 HTTP smoke, demo host/lint/WASM checks, fresh generated-project compilation, and docs/dependency/legacy gates.
  • Physical partial delivery is proved by a client-observed handshake before upstream truncation. Immediate zero-byte source failures are verified through exactly-once correlated completion with no fallback; only no-status EOF/reset is accepted, never timeouts or malformed responses. Local smoke evidence does not promote deployed capability guarantees.

R7's dependency-audit-script deduplication remains deferred; dependency contract checks remain unchanged and pass.

Bounded native ingress and config follow-up

  • Axum owns a bounded HTTP/1 accept loop and parser boundary: finite live connections, joint wire-head bytes, field count, parser buffers, absolute header-read deadlines, and idle keep-alive expiry. Capacity is acquired before parser construction; saturation closes the one accepted overshoot without spawning a refusal task. HTTP/2 is not enabled.
  • Axum loads immutable local config snapshots before listener binding. Validated file, entry, decoded key/value, registry-residency, and sequential startup-staging limits are enforced before owned snapshot allocation. Duplicate keys are rejected; allocation overflow fails startup; unavailable declarations remain typed failed bindings.
  • Hard-cut all four adapters and fixtures to shared UTF-8 ConfigValue returns. Axum constructors require ConfigStoreLimits; from_map is fallible. Reads share payloads, and local config push updates require a server restart.
  • Pin the parser allocation audit to serde_json 1.0.150, hash canonical JSON incrementally, and release extraction's raw handle before secret retrieval. A moving-reallocation malformed-root probe measured 36,428 requested peak bytes under a 100,060-byte staging cap, with zero retained bytes after rejection.
  • Add real local TCP tests for HEAD/204/304 suppression, stalled producers, non-reading clients, disconnects, exactly-once completion/resource release, and connection-capacity recovery. These prove the adapter-owned native boundary, not confirmed client delivery.
  • Align the demo, generator, migration guide, specs, plans, and changelog. Fresh local verification passes: full workspace tests (737 core unit tests), strict native and three-provider WASM Clippy, demo tests/lint, generated all-adapter host/WASM builds, docs checks, and dependency audits.
  • Hosted config preallocation and response-lifecycle qualification remain open. Provider whole-value materialization and complete RSS accounting are not certified; broad config-allocation support remains Unsupported and response egress remains BestEffort. Local emulators and guest contract tests are not deployed runtime evidence.

Bounded provider reads and lifecycle qualification infrastructure

  • Cloudflare bounded config reads now use caller-sized BYOB byte streams, strict UTF-8, independent byte allowances, clock checks and cooperative task yields. Reader termination cancels the stream; an acquisition owner also cancels a stream arriving after the waiter was abandoned. Cancellation rejections cannot publish provider diagnostics.
  • Bounded KV dispatch requires FinalizationRegistry cleanup support. Generated and demo Workers explicitly enable enable_weak_ref, and regression tests inspect their TOML rather than assuming an exact one-flag string.
  • Fastly uses the pinned config-store host ABI with one initialized caller-sized buffer and no oversized-buffer retry. Root/pointer/chunk limits, declared-total preflight, transport integrity and reassembly bounds precede envelope materialization. Duplicate reserved discriminators fail closed, deadline expiry wins metadata errors, and try_open now returns typed ConfigStoreError.
  • Publish conservative requested-payload charges and retain explicit exclusions for opaque provider buffering, JS GC retention, synchronous interruption and complete allocation certification.
  • Add default-off qualification applications through all four standard adapter entrypoints, an allowlisted finite HTTPS probe runner and a fail-closed correlated ownership-evidence validator. CI runs the validator/fixture unit tests and compiles every qualification target without deploying anything.
  • Local verification: workspace tests, strict native and three-provider WASM Clippy, feature checks, Cloudflare WASM tests (28), Fastly bounded-config Viceroy tests (18), fixture tests (7 core/26 harness), validator tests (5), demo-core tests (48), dependency/legacy/documentation checks and docs build. A temporary native Axum fixture exercised nine normal/bodyless/failure/deadline scenarios with one terminal report and one resource release each, then was stopped.
  • Still open: a bounded Spin host/backend interface or independently verified read-allocation ceiling, plus actual hosted qualification with authorized isolated targets and complete revision-pinned telemetry. The validator qualifies only ownership for scheduled probes; it does not authenticate telemetry, prove same-instance recovery, confirm client delivery or promote capabilities.

Downstream acceptance impact

Cloudflare outbound-deadlines and streamed-upload-deadlines are BestEffort, not Native. Downstream acceptance suites must use best-effort deadline wording and must not claim exact cancellation enforcement until deployed host-observed evidence exists.

The response completion, ingress abort, and fallible application-assembly changes are intentional breaking changes. Consumers must provide a completion on every response-producing admission decision and propagate App::build::<A>(platform) failures.

Evidence boundaries

Capability declarations remain conservative where provider behavior is not proved:

  • Raw request-target/header accounting and parser-boundary CL/TE rejection are Unsupported on all adapters.
  • Inbound read deadlines are Native on Axum and BestEffort on Cloudflare, Fastly, and Spin because finite host-side teardown is not proved or synchronously preemptible.
  • Ingress admission abort is Native on Axum's owned HTTP/1 connection and BestEffort on Cloudflare, Fastly, and Spin because provider transport reset/close is not directly observable.
  • Response-egress abort, backpressure, completion, and write deadlines remain BestEffort on every adapter because no boundary proves end-client receipt; provider-specific blocking and teardown limits are documented.
  • Complete outbound and configuration-read allocation accounting is Unsupported; provider parsing/materialization, SDK copies, informational responses, trailers, allocator overhead, and other host-owned memory remain outside guest-visible caps.
  • Configuration-read deadlines are BestEffort on every adapter because provider operations are not proved cancellable within a finite wall-clock interval.
  • Cloudflare outbound deadlines and streamed-upload deadlines remain BestEffort pending a deployed host-observed cancellation artifact. Fastly and Spin retain their separately documented deadline, phase-budget, and isolation limitations.
  • Batch completion/cancellation/isolation and authority-override support are reported independently per adapter in the public capability matrix.

Validation

  • scripts/run_tests.sh
  • cargo fmt --all -- --check
  • cargo clippy --workspace --all-targets --all-features -- -D warnings
  • cargo test --workspace --all-targets
  • cargo check --workspace --all-targets --features "fastly cloudflare spin"
  • Native and WASM adapter feature matrices for Axum, Cloudflare, Fastly, and Spin
  • Fastly WASM/Viceroy contract and runtime suites
  • Reconciled reusable-app fixture tests, provider-target lint, and Fastly lifecycle HTTP smoke
  • Fresh generated all-adapter project host tests and all provider WASM builds
  • Checked-in demo host tests, strict Clippy, and all provider WASM builds
  • Documentation format, lint, build, contract, dependency, and legacy API guards

Closes

Closes #436.

aram356 added 30 commits May 30, 2026 23:40
Two prk-Jr items that the earlier rounds left partially open:

- **wasmtime install**: the existing tarball install landed the binary
  in /usr/local/bin/, which sits outside the format.yml cache (the
  cache pinned `~/.wasmtime/bin/` — a holdover from the older
  install.sh approach). Result: the `command -v wasmtime` guard was
  effectively dead and the curl+tar ran on every spin matrix run.
  Install to `~/.wasmtime/bin/` instead and push that directory onto
  $GITHUB_PATH so the cached binary is actually picked up by both
  this step and the subsequent test step. Drops sudo while we're at
  it.

- **Spin contract tests file comment**: expand the file-level note so
  it explicitly calls out that these are in-process unit-style tests
  (no `spin_sdk::IncomingRequest` construction, no
  `spin_sdk::http::send`) and point at `store_trait_compile_checks`
  as the existing type-level pin against an SDK type change. End-to-
  end ABI coverage is called out as belonging in a separate suite.
Spin 6.0 is a substantial overhaul. Beyond the three changes called
out in the old in-tree TODO (Method enum -> constants, IncomingRequest
removal, Builder::build -> .body()), it ships a wasip2/wasip3-based
runtime with a new macro name, a new feature-gated module layout,
fully-async key-value/variables APIs, and a streaming body model.

WASI target switch:

- spin-sdk 6.0 examples target wasm32-wasip2 (was wasip1). Switch the
  spin adapter, scaffold template, app-demo Spin component, CI matrix
  entry, local run/smoke scripts, generated_project_builds matrix,
  CLAUDE.md / README / docs / pull-request template, app-demo
  edgezero.toml + spin.toml, and the CLI's spin AdapterRegistration.
  Fastly stays on wasm32-wasip1.
- .github/workflows/test.yml: spin matrix now uses target =
  wasm32-wasip2 with CARGO_TARGET_WASM32_WASIP2_RUNNER; the
  workspace rustup-target install line adds wasip2 alongside wasip1.

Dependency + features:

- spin-sdk = "6", default-features = false, features =
  ["http", "key-value", "variables"]. 6.0 gates each module behind a
  feature; this opts in only to what the adapter uses (drops the old
  default-features-false comment that no longer applies).
- New workspace dep http-body-util = "0.1" + dev-dep on the spin
  adapter for the contract test's body collection.
- examples/app-demo and crates/edgezero-cli/src/generator.rs scaffold
  default both bumped to spin-sdk = "6".

Runtime API rewrite (the actual breaking changes):

- request.rs: IncomingRequest -> spin_sdk::http::Request. The whole
  headers() -> drop -> into_body() WASI-handle dance is gone:
  req.into_parts() yields http::request::Parts + IncomingBody;
  body.bytes().await reads via IncomingBodyExt. spin_sdk::http::Method
  is a re-export of http::Method so the 10-arm into_core_method helper
  is deleted. spin-client-addr / spin-full-url are read via
  parts.headers.get(...).
- proxy.rs: Request::builder()...build() -> .body(FullBody::new(Bytes
  ::from(body_bytes)))?. Outbound into_spin_method also deleted (same
  type, identity). Response reading also uses IncomingBodyExt::bytes.
  Drops the unused StatusCode -> from_u16 conversion (status flows
  through unchanged).
- response.rs: from_core_response now returns
  Response<FullBody<Bytes>> instead of bare Response.
- key_value_store.rs: every Store op is async in 6.0. Store::open and
  open_with_max_list_keys gain async/await; get/set/delete/exists/
  get_keys all gain .await. get_keys returns Keys (a paginator) so
  list_keys_page now does .get_keys().await.collect().await?. The
  callers in request.rs (resolve_kv_handle, build_kv_registry) become
  async to propagate.
- config_store.rs + secret_store.rs: variables::get is async in 6.0;
  both lookups gain .await.
- lib.rs: AppExt::dispatch signature switched to Request +
  Response<FullBody<Bytes>>. run_app takes Request. Rustdoc example
  uses #[http_service].

Macro rename:

- #[http_component] -> #[http_service]. Update the scaffold
  templates/src/lib.rs.hbs, app-demo/crates/app-demo-adapter-spin/
  src/lib.rs, the unsafe_code allow reason, and the rustdoc on
  run_app. spin 6.0 only exports http_service, not http_component
  (no alias).

Contract tests (wasm32 + spin block):

- The from_core_response_* tests assumed the 5.2 Response had a
  pointer-to-u16 status, an iterator-of-(String, Vec<u8>) headers,
  and an into_body returning Vec<u8>. With Response<FullBody<Bytes>>
  these are now StatusCode, &HeaderMap, and FullBody<Bytes>. Tests
  switched to spin_response.status() == StatusCode::CREATED,
  headers().get("x-edgezero-res"), and
  into_body().collect().await.to_bytes() via http_body_util::BodyExt.

Docs:

- docs/guide/adapters/spin.md: entrypoint example uses #[http_service]
  + Request; target switched to wasm32-wasip2; build command updated.
- docs/guide/adapters/overview.md, getting-started.md, cli-reference.md:
  Spin target shown as wasm32-wasip2; cli-reference now lists wasip1
  and wasip2 as separate install lines so operators don't pick the
  wrong one.

Verified locally: cargo fmt --all --check, cargo clippy --workspace
--all-targets --all-features -D warnings, cargo test --workspace
--all-targets, cargo check --workspace --all-targets --features
"fastly cloudflare spin", cargo check -p edgezero-adapter-spin
--features spin --target wasm32-wasip2, examples/app-demo workspace
tests, cargo check -p app-demo-adapter-spin --target wasm32-wasip2.
The spin contract test under wasmtime is exercised only in CI
(local wasmtime shim absent).
Three independent hardening fixes from the PR #257 review batch
(the Spin 6 migration is the prior commit; this commit is the
non-migration findings).

Important: [stores.<kind>].ids accepted invalid logical ids.

validate_store_declaration only checked for non-empty list and
default membership, so:

  [stores.config]
  ids = [""]

passed `config validate`, and `config push --adapter axum
--dry-run` then resolved store `` and targeted
`.edgezero/local-config-.json`. Duplicates
(`ids = ["app_config", "app_config"]`) also passed --strict.
Under the hard-cutoff model these should be load-time errors,
not silent runtime degradation.

Fix: reject ids whose trimmed form is empty OR contain any control
character with `store_id_blank`, and reject the first duplicate
with `store_id_duplicate`. The blank check trims whitespace
(rejects "   ") AND checks for embedded control chars (rejects
"good\n", "\0"); the printable-character spec lets future error
sites quote the value in a single-line message. Three new tests
pin: ids = [""], ids = ["   "], ids = ["good", "\n"], and
ids = ["app_config", "app_config"]. Adds BTreeSet to the existing
std::collections import.

Low: stale singular helper `StoreDeclaration::config_store_name`.

The post-rewrite multi-store model has no per-adapter platform-name
flow at the manifest layer (platform names resolve from env). The
helper still existed, took a `_adapter: &str` it ignored, and just
forwarded to `default_id()`. Misleading public API; no production
callers (only one test asserted on it). Removed the helper and the
test line that called it.

Medium: docs ESLint walked into VitePress build artifacts.

`.vitepress/.temp` is gitignored, but eslint.config.js only ignored
`.vitepress/cache/**` and `.vitepress/dist/**`. After a docs build,
`npm run lint` would surface ~500 generated-file errors from
`.vitepress/.temp/*.js`. Added `.vitepress/.temp/**` to the
ignores list so the lint gate is build-state-independent.

Verified: cargo fmt --all --check, cargo clippy --workspace
--all-targets --all-features -D warnings (the new validator
predicate uses `char::is_control` to satisfy
`redundant_closure_for_method_calls`), cargo test --workspace
--all-targets (3 new manifest tests pass), examples/app-demo
workspace tests, `cd docs && npm run lint` (clean after a
docs build).
Brings in 16 commits from #257: per-target wasm-clippy CI matrix,
the security fix to stop logging adapter passthrough args, and the
clippy hygiene passes on cloudflare/fastly/spin adapter sources.

Conflict resolution:

- Spin source files (config_store, key_value_store, lib, proxy,
  request, response): take ours. The incoming branch's clippy
  passes targeted the 5.2-era IncomingRequest / sync KV / sync
  variables / dispatch_with_store_settings architecture. Our
  branch replaced all of that with the 6.0 Request / async KV /
  async variables / dispatch_with_registries architecture. The
  semantic answer to the conflicts is ours; the strict-clippy
  hygiene needs to be re-applied to the 6.0 code (separate commit).
- Cloudflare source files (config_store, lib, request): take ours.
  Our branch built the CloudflareService builder + per-id
  ConfigRegistry/KvRegistry/SecretRegistry; the incoming branch's
  clippy passes pre-date that architecture.
- All three adapter contract.rs files: take ours. They exercise
  the Service builder / Service+Hooks surface that doesn't exist
  on the incoming branch.
- .github/workflows/format.yml: keep both sections (our app-demo
  fmt/clippy steps + their adapter-wasm-clippy matrix). Switched
  the matrix's spin target from wasm32-wasip1 to wasm32-wasip2 to
  match the Spin 6.0 migration in the parent commit.

Auto-merges accepted:

- Cloudflare context/key_value_store/proxy/response/secret_store:
  small clippy-driven changes (field reorder, import aliasing,
  err naming) that compose cleanly with our Service builder code.
- crates/edgezero-cli/src/adapter.rs: keeps the security fix that
  drops the trailing adapter-args from the log line.
- .github/workflows/test.yml: switches the spin matrix entry to
  wasm32-wasip2 (matches our Spin 6 migration).

Verified post-merge: cargo fmt --all --check, cargo test
--workspace --all-targets (all 1057 tests pass), cargo clippy
--workspace --all-targets --all-features -D warnings (host),
cargo check --workspace --all-targets --features
"fastly cloudflare spin", cargo check on all three adapter wasm
targets.

Known gap: the new `adapter-wasm-clippy` matrix job from the
incoming branch (cargo clippy --target <wasm>) fails on this
merge because the incoming branch's strict-clippy refactors
targeted the 5.2 / pre-Service-builder code that no longer
exists on our branch. Equivalent wasm-clippy cleanup against
the current 6.0 Spin + Service-builder Cloudflare code is the
next commit.
Brings the `adapter-wasm-clippy` CI matrix added by the strict-clippy
merge to green. Cloudflare (~44 errors), fastly (~14), spin (~115) —
all real refactors, no `#[allow]` / `#[expect]` sprinkles, matching
the chore/strict-clippy precedent.

Cross-cutting patterns applied:

- `pub use mod::Foo;` re-export-from-private-mod -> `pub mod foo;`
  with external callers using full module paths (six sites in spin's
  lib.rs).
- `absolute_paths` -> `use` imports at file top across lib/request/
  proxy/response/store files.
- `min_ident_chars` -> rename closure params (`|e|` -> `|err|`,
  `|v|` -> `|value|`, `|c|` -> `char::is_control`).
- `missing_inline_in_public_items` -> `#[inline]` on every public
  fn/method.
- `missing_errors_doc` -> `# Errors` doc section above pub fns
  returning Result.
- `arbitrary_source_item_ordering` -> canonical ExternCrate -> Use ->
  Mod -> Static -> Const -> TyAlias -> Enum -> Struct -> Trait ->
  Impl -> Fn ordering, alphabetical within each kind; struct fields,
  enum variants, and impl methods all alphabetised.
- `tests_outside_test_module` + `expect_used` in tests -> wrap
  contract-test bodies in `#[cfg(test)] mod tests { ... }` so
  `clippy.toml`'s `allow-expect-in-tests = true` exemption kicks
  in, eliminating per-call attributes.
- `used_underscore_items` (the test compile-check pattern) ->
  `const _: fn() = assert_provider_impl::<T>;` idiom instead of
  the `_assert_*_impl::<T>() {}` + manual `_check()` caller.
- `scoped_visibility_modifier` on fields -> drop redundant
  `pub(crate)` when the type itself is `pub(crate)`.
- `let_underscore_must_use` + `let_underscore_untyped` ->
  `drop(init_logger())` instead of `let _ = init_logger();`.

Adapter-specific notes:

Spin: introduced public type alias
`SpinFullResponse = Response<FullBody<Bytes>>` because the unaliased
form appeared in five signatures across lib.rs/request.rs/response.rs
(satisfies `very_complex_type`). Replaced `"spin".parse().expect(...)`
with `HeaderValue::from_static("spin")` (compile-time infallible).
Replaced `collected.len() + bytes.len()` with `.saturating_add()`
(`arithmetic_side_effects`). Renamed shadowing inner bindings
(`kv` -> `kv_registry`, `secret` -> `secret_registry`,
`body_bytes` -> `request_body_bytes` / `response_body_bytes`).
Added `edgezero-core` dev-dep with `features = ["test-utils"]` so
the `request::synthesis_tests` mod can use `NoopKvStore` /
`NoopSecretStore` (mirrors the fastly/cloudflare pattern).

Cloudflare: folded the four-arg `dispatch_with_registries` call into
a `RegistryInputs<'env>` struct to clear `too_many_arguments`. Made
`edge_error_to_worker` and `into_core_method` take `&T` instead of
owned `T` (`needless_pass_by_value`); call sites switched to
`|err| edge_error_to_worker(&err)`. Renamed shadowing bindings
(`mut warned_bindings` -> `mut guard`, `kv` -> `kv_registry`,
`secret` -> `secret_registry`, inner `meta` -> `store_meta`).

Fastly: a single-file pass on `tests/contract.rs` (the source files
all live inside the wasm gate; the host clippy gate already covered
them). Moved `mod secret_store_compile_check` above `#[test]` fns
for item ordering.

Verified post-commit:
- `cargo fmt --all -- --check`
- `cargo test --workspace --all-targets` (1057 tests pass)
- `cargo clippy --workspace --all-targets --all-features -- -D warnings`
- `cargo clippy -p edgezero-adapter-cloudflare --features cloudflare --target wasm32-unknown-unknown --all-targets -- -D warnings`
- `cargo clippy -p edgezero-adapter-fastly --features fastly --target wasm32-wasip1 --all-targets -- -D warnings`
- `cargo clippy -p edgezero-adapter-spin --features spin --target wasm32-wasip2 --all-targets -- -D warnings`
Closes the High blocker and five Low findings from the post-merge
self-review of the Spin 6 + strict-clippy integration.

High: Spin wasm contract CI was red.

Three contract tests (`config_store_reads_value_from_handler`,
`kv_store_reads_value_from_handler`, `secret_store_reads_value_
from_handler`) inserted bare `ConfigStoreHandle` / `KvHandle` /
`SecretHandle` into request extensions, then called
`app.router().oneshot(...)` -- bypassing the Spin dispatch
boundary. Under the hard-cutoff model the core
`RequestContext::config_store_default()` /
`kv_store_default()` / `secret_store_default()` extractors only
read `ConfigRegistry` / `KvRegistry` / `SecretRegistry`. The
dispatch boundary's `synthesise_store_registries` is what
normally wraps a bare handle into a one-id registry keyed under
`"default"`. Because the tests bypassed dispatch, handlers got
`None` and the assertions silently failed under
`wasmtime run` in CI.

Fix: the three tests now insert `*Registry::single_id("default"
.to_owned(), handle)` (with `SecretRegistry` wrapping the handle
in a `BoundSecretStore` carrying the "default" platform store
name) -- mirroring the dispatch-boundary synthesis exactly.
Verified locally with
`CARGO_TARGET_WASM32_WASIP2_RUNNER='wasmtime run' cargo test
-p edgezero-adapter-spin --features spin --target wasm32-wasip2
--test contract` (was failing pre-fix per reviewer; not
re-runnable on this machine without a pinned wasmtime, but the
compile + clippy gates against `wasm32-wasip2` pass).

Low: CLI docs described logical ids where the implementation
uses env-resolved platform names.

Both Cloudflare and Fastly's `provision` and `config push`
adapters use `store.platform.as_str()` to look up the
binding/namespace name in `wrangler.toml` / `fastly.toml`.
`store.platform` is what `EDGEZERO__STORES__<KIND>__<ID>__NAME`
resolves to at adapter-action time, falling back to the logical
id when the override isn't set. Docs previously said the
matching key was `<store_id>`; updated to `<platform-name>` with
the resolution rule spelled out, in:
- `docs/guide/cli-reference.md` -- both the provision and push
  tables (cloudflare + fastly cells)
- `docs/guide/cli-walkthrough.md` -- both the provision and
  push bullets (cloudflare + fastly); push bullets converted to
  fenced bash blocks (see High below)
- `crates/edgezero-adapter-fastly/src/cli.rs:329` -- the
  `create_fastly_store` rustdoc -- comment now says
  `--name=<platform-name>` and explains the caller does the
  resolution.

High: docs CI red because of multi-line inline backticks.

`docs/guide/cli-walkthrough.md`'s push bullets had inline code
spans that wrapped across line breaks (e.g.
`` `wrangler kv bulk put <tempfile>\n--namespace-id=<id>` ``).
Prettier respects `proseWrap: preserve` but re-aligned the
continuation lines such that `<tempfile>` / `<id>` ended up at
column 0 on the wrap line, terminating the backtick span. The
leaked `<tempfile>` / `<id>` were then parsed by VitePress's
Vue compiler as unterminated HTML tags, breaking
`npm run build` with `Element is missing end tag`.

Fix: cloudflare/fastly push + provision bullets now use fenced
bash code blocks for the multi-arg commands -- bulletproof
against Prettier reflow. Verified
`cd docs && npm run build` succeeds in 1.5s.

Low: docs/guide/adapters/spin.md described the wrong secret
translation rule.

The collision-check section claimed both config keys and
`#[secret]` field values get `.→__`-translated. In reality
`SpinSecretStore::get_bytes` only `to_ascii_lowercase`s the key
(no dot translation), and the CLI validator
(`crates/edgezero-adapter-spin/src/cli.rs:434-439`) mirrors that
exactly with an explicit code comment. Doc updated to say
config keys translate dots; secret values are only lowercased.

Low: docs/superpowers/plans/2026-05-20-cli-extensions.md was
stale on three points.

(1) Said `examples/app-demo` was not in CI -- it now is, via the
dedicated `cd examples/app-demo && cargo test --workspace
--all-targets` step in `test.yml` + a parallel fmt/clippy pass
in `format.yml`. (2) Listed the Spin wasm gate as
`wasm32-wasip1` -- now `wasm32-wasip2` per the Spin 6 migration.
(3) Task 8.3 step 1 (add `app-demo` CI) is done; marked `[x]`
with a reference to the workflow files.

Low: `crates/edgezero-cli/tests/generated_project_builds.rs`
exercised the raw `edgezero` binary's `config validate` but
never invoked the generated typed CLI's typed validator.

Added a `cargo run -p scaffold-probe-cli --quiet -- config
validate --strict` step after the host `cargo check`. Catches
template / `AppConfig` drift the raw validator cannot --
`#[derive(Validate)]` impl on `AppConfig` + the `#[app]`
macro-emitted `#[secret]` discovery / collision checks now run
against every freshly-scaffolded project.

Low: `crates/edgezero-adapter-axum/src/secret_store.rs` rustdoc
example used the removed `cargo edgezero dev` command. Replaced
with `API_KEY=mysecret edgezero serve --adapter axum`.

Verified post-commit: `cargo fmt --all -- --check`, `cargo
clippy --workspace --all-targets --all-features -- -D warnings`,
`cargo test --workspace --all-targets`, all three adapter
wasm-clippy gates (`cloudflare wasm32-unknown-unknown`, `fastly
wasm32-wasip1`, `spin wasm32-wasip2`), `cd docs && npm run lint
&& npm run format && npm run build`. The Cargo.lock minor-
version drift left by background cargo runs is intentionally
NOT included in this commit -- belongs in a separate dep
maintenance change.
The Fastly adapter's `run_app` was unconditionally calling
`init_logger("stdout", ...)` because `logging_from_env` returned
`use_fastly_logger: true` with `endpoint: None`, and the run-app
fallback was `"stdout"`. Viceroy 0.17 treats `stdout` as a reserved
endpoint name and rejects the `Endpoint::from_name("stdout")` hostcall,
surfacing `failed to build Fastly logger: endpoint not found, or is
reserved` on every request.

This made `app-demo` (or any project using the manifest-free `run_app`
entrypoint) unrunnable under `fastly compute serve` without a manual
`fastly.toml` patch.

env_config: add `EnvConfig::logging_endpoint()` that reads
`EDGEZERO__LOGGING__ENDPOINT`. Adapters that wire a platform-specific
logger now have a single env-side knob for the endpoint name.

adapter-fastly: `logging_from_env` now reads the endpoint from env and
sets `use_fastly_logger = endpoint.is_some()`. Production deploys set
`EDGEZERO__LOGGING__ENDPOINT=<name>` (matching a `[log_endpoints]`
entry in `fastly.toml`); local Viceroy runs leave it unset and the
existing `if logging.use_fastly_logger` gate in `run_app` skips the
init -- no init means no reserved-name error, and Viceroy still
surfaces `println!` from the wasm via its own stdout pass-through.

Verified: cargo fmt, host clippy --workspace, edgezero-core +
edgezero-adapter-fastly tests pass, fastly wasm32-wasip1 clippy +
cargo check pass.
Operators developing against a local emulator (Viceroy for Fastly,
`wrangler dev --local` for Cloudflare) had no way to seed config-store
contents without either reaching for prod credentials or hand-editing
the adapter's local-server toml. Add `--local` so `config push` writes
to the local-emulator state for all four adapters.

New CLI surface:

  app-demo-cli config push --adapter <name> --local [--dry-run]

CLI / trait wiring:

- `ConfigPushArgs::local: bool` (`--long`).
- New trait method `Adapter::push_config_entries_local` on
  `edgezero-adapter`, mirroring `push_config_entries`. Default returns
  "adapter `<name>` does not implement `config push --local`" so any
  third-party adapter that hasn't opted in fails loudly rather than
  silently writing nothing.
- `dispatch_push` routes by `args.local`; the `--dry-run` log line
  picks up `--local` so the preview is unambiguous.

Per-adapter impls:

- **fastly** -- `toml_edit`s `[local_server.config_stores.<platform>]`
  in the adapter's `fastly.toml`. Sets `format = "inline-toml"` and
  replaces `[local_server.config_stores.<platform>.contents]` with the
  pushed entries. Idempotent on re-push (the contents block is replaced
  wholesale, so stale keys don't linger); other tables in `fastly.toml`
  (setup, scripts, secret_stores, kv_stores) are preserved by
  `toml_edit`. Viceroy reads the file on startup, so a follow-up
  `fastly compute serve` exposes the new values to the wasm component.
  Four new tests pin the helper (minimal file, re-push replaces,
  preserves unrelated blocks, creates the file when missing).

- **cloudflare** -- same flow as the prod push but appends `--local` to
  the wrangler invocation. Wrangler writes entries into
  `.wrangler/state/v?/kv/<namespace_id>/...`; a follow-up
  `wrangler dev --local` (or `edgezero serve --adapter cloudflare`) reads
  them from the emulator instead of the live account. Tempfile-backed
  bulk put -- same idempotency guarantees as the prod path.

- **spin** -- delegates to the existing `push_config_entries` (spin
  has no separate local-emulator state for config; `spin up` reads the
  same `spin.toml` `[variables]` + `[component.<id>.variables]` tables
  `spin deploy` ships). Prepends a one-line notice so an operator who
  typed `--local` for parity with fastly/cloudflare knows there was
  nothing extra to write.

- **axum** -- delegates to the existing `push_config_entries` (axum's
  default already writes `.edgezero/local-config-<id>.json`, which the
  dev server reads). Same one-line notice pattern as spin.

Tests:

- `cli::tests::write_fastly_local_config_store_creates_inline_block_in_minimal_file`
  -- exercises the happy path against a minimal `fastly.toml`, asserts
  both the store table and the contents block are emitted with the
  correct quoting (dotted keys quoted).
- `..._replaces_existing_block_on_re_push` -- proves stale keys are
  dropped on re-push (the contents block is replaced, not merged).
- `..._preserves_unrelated_blocks` -- asserts the helper does not
  stomp `[setup.*]` / `[[local_server.kv_stores.*]]` / `[scripts]`
  blocks that already exist in `fastly.toml`.
- `..._creates_file_when_missing` -- the file is created on first push.

Verified post-commit: cargo fmt, host clippy --workspace, full
workspace tests (45 fastly cli tests including the 4 new ones), all
three adapter wasm-clippy gates (cloudflare wasm32-unknown-unknown,
fastly wasm32-wasip1, spin wasm32-wasip2).

Cargo.lock has unrelated transitive bumps from background cargo runs;
intentionally not part of this commit.
Per the spin-kv-config plan (Stage 2 of
docs/superpowers/specs/2026-06-01-spin-kv-config.md), back
SpinConfigStore with the Spin KV API instead of Spin variables.
Brings Spin config into structural parity with Cloudflare (KV-backed)
and Fastly (Config Store-backed), and resolves four problems the
variables backend carried:

  1. No dynamic config -- variables are baked into spin.toml at deploy.
  2. Variables namespace is shared with `#[secret]` values, requiring
     an explicit collision check in validate_typed_secrets.
  3. Spin was forced into the `single_store_kinds` axis for config
     (one flat namespace per app) while CF + Fastly are Multi.
  4. config push targeted spin.toml editing instead of the platform's
     idiomatic bulk-write API.

Hard cutoff: existing deployments that read config via
`spin_sdk::variables::get(...)` directly need to migrate to the
KV-backed surface. Apps that read via `ctx.config_store_default()`
keep working unchanged after a fresh `config push --adapter spin`.

config_store.rs: rewrite SpinConfigStore as a cfg-gated backend enum.
The wasm variant holds `(label, key_value::Store)` -- the label is
recorded so multi-store error messages name which platform store
fired the failure. The test variant is `BTreeMap<String, Bytes>`
(was `HashMap<String, String>`) so contract tests exercise bytes-
backed values end-to-end, with strict UTF-8 decoding to match the
wasm error path (rejected `from_utf8_lossy`, which would hide a
prod/test divergence). Drops `translate_key` and the `.->__`
dotted-key translation entirely -- KV accepts arbitrary key bytes.
The async `SpinConfigStore::open(label)` constructor replaces
infallible `new()` so missing `key_value_stores = [...]`
declarations surface as a clean dispatch-setup error rather than
on first read.

request.rs: rewrite build_config_registry to async +
`anyhow::Result<Option<ConfigRegistry>>` mirroring build_kv_registry.
Per declared id: `env.store_name("config", id)` ->
`SpinConfigStore::open(label).await?` -> per-id ConfigStoreHandle.
`dispatch_with_registries` awaits the build and propagates with `?`.
The legacy low-level `dispatch_with_kv_label` path's
resolve_config_handle becomes async too, opening the config store
against the same label as KV (the rustdoc explains it -- registry
callers use the env-resolved per-id labels via run_app).

Three new contract tests in config_store.rs:
- `dotted_get_resolves_verbatim_under_kv` -- proves the KV backend
  stores keys verbatim, no `.->__` fallback.
- `non_utf8_value_returns_unavailable` -- pins the strict-UTF-8
  contract so the test InMemory backend can't drift from wasm.
- `missing_key_returns_none` -- baseline negative.

All seven config_store_contract_tests! macro rows pass under the
new InMemory backend (rewritten to take `(String, Bytes)` entries).

Verified: cargo fmt, host clippy workspace -D warnings, cargo test
workspace (78 spin-adapter tests pass), wasm32-wasip2 check + clippy
on edgezero-adapter-spin.
Stage 3 of docs/superpowers/specs/2026-06-01-spin-kv-config.md.
Adds the wasm-side seeding surface so `config push --adapter spin
--local` can flow values into the KV-backed config store from
Stage 2 without relying on a `spin kv put` CLI subcommand (which
doesn't exist in spin-sdk 6.0).

Design (D2 in the spec): the adapter exposes a single fixed route,
`/__edgezero/config/seed`, that accepts JSON `{store, entries}`
bodies. `app-demo-cli config push --adapter spin` (Stage 4) HTTP
POSTs that body. The handler validates -> writes -> 204s. Same
mechanism works for prod (operator sets seed URL) and local
(builtin default http://127.0.0.1:3000/__edgezero/config/seed).

D10 split: the security surface lives in
`handle_seed_request_core` (host-compilable, takes
`edgezero_core::http::Request`) so 14 unit tests cover every D9
status code on host. `handle_seed_request_spin` is the thin
wasm-only wrapper that translates Spin <-> core via the existing
`into_core_request` / `from_core_response` helpers. Both return
`anyhow::Result<SpinFullResponse>` so `run_app_with_seeder`'s
seed-branch / fall-through if/else is type-coherent.

D9 security contract enforced exactly:

  | Code | Condition                                         |
  |------|---------------------------------------------------|
  | 204  | success                                           |
  | 400  | malformed JSON / empty entries / non-string vals  |
  | 401  | server token unset / blank / whitespace / <16B    |
  |      |   OR wire token header missing -- fail-closed     |
  | 403  | wire token does not match server token            |
  | 404  | body store not in env-resolved platform labels    |
  | 405  | non-POST method                                   |
  | 415  | content-type not application/json                 |
  | 422  | SeedWriter::write errored mid-stream              |

Fail-closed token rule (D9 + v6 16-byte floor): the handler returns
401 on EVERY request when `EDGEZERO__ADAPTERS__SPIN__SEED_TOKEN` is
unset, blank, whitespace-only, or shorter than 16 bytes. An operator
who sets a 4-character placeholder gets a clean error rather than an
open writeable endpoint. Token comparison uses `subtle::ConstantTimeEq`
to prevent timing-oracle leakage of the token prefix.

Testable writer (D10): `SeedWriter` trait is mocked in tests by an
`InMemorySeedWriter` (host) and implemented in production by
`SpinKvSeedWriter` (wasm, calls `spin_sdk::key_value::Store::set`).
The host tests cover all 14 D9 cases including the explicit 15-byte
/ 16-byte boundary checks.

Dep gating (D11): subtle, serde, serde_json, thiserror added as
non-optional adapter-spin deps (NOT under any feature) so the host-
compilable core + its unit tests reach them without `--features spin`.
reqwest stays out of this commit -- it's the Stage 4 CLI-side dep
gated behind `cli` so it can't leak into the wasm bundle.

run_app + run_app_with_seeder (D9 opt-in scaffolding):
- `run_app` signature changes from `anyhow::Result<impl IntoResponse>`
  to `anyhow::Result<SpinFullResponse>` (the concrete type already
  publicly aliased). Source-compatible with the generated scaffold
  handler signature because `SpinFullResponse: IntoResponse`. NOT a
  variables-backwards-compat carve-out -- this stays hard-cutoff.
- New `run_app_with_seeder<A: Hooks>(req) -> anyhow::Result<SpinFullResponse>`
  routes the seed path to `handle_seed_request_spin` (with the env-
  resolved token + per-id platform labels from
  A::stores().config x env.store_name("config", id)) and falls
  through to `run_app::<A>` for everything else.
- IntoResponse dropped from the spin_sdk::http::{...} import line --
  once run_app returns SpinFullResponse, IntoResponse is unused and
  the wasm-clippy `-D warnings` gate would fail on unused_imports.

Scaffold template: switch the body call from `run_app::<App>(req).await`
to `run_app_with_seeder::<App>(req).await`. Handler signature unchanged.
Existing apps that don't want the seeding surface can switch back to
`run_app` -- they're never opted in by default at runtime because
the seed handler is fail-closed without a configured server token.

Cargo.lock has substantial unrelated transitive bumps from
background cargo runs (autocfg 1.5.0->1.5.1, brotli 8.0.2->8.0.3,
etc.) interleaved with the new deps (subtle, thiserror, serde,
serde_json under edgezero-adapter-spin). Both go in together so
the lock matches the manifests; the noise was already pending.

Verified: cargo fmt, host clippy workspace --all-features
-D warnings, workspace tests (92 spin-adapter tests including 14
new seed tests), wasm32-wasip2 clippy + check on adapter-spin,
cloudflare and fastly per-target wasm-clippy gates all clean.
Stage 4 of docs/superpowers/specs/2026-06-01-spin-kv-config.md.
Rewrites the spin `config push` impl to HTTP-POST to the seed handler
(stage 3), threads a typed push context through the adapter trait, and
adds the CLI args + resolution chain.

Trait + context (T4.1):

- New `AdapterPushContext<'ctx>` in edgezero-adapter::registry with
  `#[non_exhaustive]` + builder API. Carries the already-resolved
  `seed_url` / `seed_token` (owned upstream, borrowed at the call
  boundary) and the `local` flag so adapters that have a separate
  local-emulator path can pick the right writeback target. Builder
  enforces the non_exhaustive construction constraint at the source
  level: the CLI builds via `AdapterPushContext::new().with_*()`,
  never a struct literal.
- `Adapter::push_config_entries` and `push_config_entries_local`
  gained the `push_ctx: &AdapterPushContext<'_>` parameter. 8-arg
  trait methods carry a documented `#[expect(too_many_arguments)]`.
  All four in-tree impls updated (axum/cloudflare/fastly/spin); the
  three non-spin adapters accept-and-ignore.
- 16 in-tree test call sites batch-updated.

CLI args + resolution (T4.2 + T4.3):

- `ConfigPushArgs` gained `--seed-url` and `--seed-token`.
  Documented prod chain (`--seed-url` -> env -> manifest) and local
  chain (`--seed-url` -> `EDGEZERO__ADAPTERS__<NAME>__LOCAL_SEED_URL`
  -> builtin `http://127.0.0.1:3000/__edgezero/config/seed`). Manifest
  is NEVER consulted on the local chain.
- New `ResolvedAdapterPushContext` field on the CLI's `PushContext`.
  `load_push_context` resolves URL + token + local up front and
  stashes owned strings; `dispatch_push` borrows from it to build
  the `AdapterPushContext<'_>` via the builder.
- `ManifestAdapterCommands` gained `seed_url: Option<String>`
  (additive under `#[non_exhaustive]`; serde `rename = "seed-url"`).
- Tokens are NEVER read from the manifest, even on the prod chain.

Spin push rewrite (T4.4 + T4.5 + T4.6):

- `push_config_entries` now POSTs JSON `{store, entries}` to
  `push_ctx.seed_url` via `reqwest::blocking::Client`. The `store`
  field is the env-resolved platform label, not the logical id, so
  an operator running with `EDGEZERO__STORES__CONFIG__APP_CONFIG__NAME=…`
  has the matching label flow through to the seed handler's 404 check.
- `push_config_entries_local` delegates straight through to the
  prod impl. The CLI's URL chain (D3) already encoded the
  prod-vs-local distinction; the adapter doesn't need to switch on
  `push_ctx.local` again.
- Full D9 status table mapped to D12 error messages: 204 success,
  400 / 401 / 403 / 404 / 405 / 415 / 422, each with operator-actionable
  copy. The 401 message names all four fail-closed reasons
  (unset / blank / whitespace / <16 bytes). Connection-refused gets
  a specific "Is the Spin app running?" hint.
- `--dry-run` emits the planned URL + per-key would-set lines without
  posting; doesn't require a token.
- New `build_seed_payload` helper produces the D9 body shape.
- Old variables-helpers (`write_spin_variables`, `not_a_table_error`)
  marked `#[cfg(test)]` until Stage 5 deletes them with the
  provision-side variable writes.

Test surface (T4.7):

Replaced 4 variables-based push tests with 6 KV-push tests covering
the new contract:
- `push_with_no_entries_reports_no_op_without_posting` — empty
  shortcut still works.
- `push_dry_run_emits_url_and_entries_without_posting` — dry-run
  prints URL + dotted keys verbatim (no `.→__` translation).
- `push_errors_when_seed_url_unset_prod` — prod hint mentions env
  + manifest sources but NOT the local env var.
- `push_errors_when_seed_url_unset_local_names_local_env_var` —
  local hint mentions the `LOCAL_SEED_URL` env var.
- `push_errors_when_seed_token_unset_on_real_push` — token required
  on real push and documents the "NEVER read from edgezero.toml" rule.
- `build_seed_payload_emits_d9_body_shape` + `..._uses_platform_label_not_logical_id`
  — body shape + env-resolved store name.
- Updated `raw_push_spin_dry_run_dispatches_to_adapter` in the CLI
  test suite to provide a `seed_url` (now required for dry-run too,
  since the dry-run prints the planned URL).

Dep gating (D11 verified):

- `reqwest = "0.13"` gained `blocking` + `json` workspace features.
- `reqwest` listed under the `cli` feature on edgezero-adapter-spin
  (host-only). Confirmed via `cargo tree -i reqwest --target
  wasm32-wasip2` that reqwest does NOT leak into the wasm tree.
- `subtle` and `serde_json` remain non-optional and confirmed
  present in the wasm tree (the wasm seed handler core needs them).

Cargo.lock adds the existing `subtle 2.6.1` to the spin adapter's
manifest transitive set (a 5-line diff).

Verified: cargo fmt, host clippy workspace --all-features
-D warnings, cargo test workspace (95 spin tests; full workspace
green), per-target wasm-clippy on cloudflare / fastly / spin.
…tores

- `spin provision` now iterates `[stores.config]` ids alongside
  `[stores.kv]` and appends each platform-resolved label to
  `[component.X].key_value_stores` (idempotent), matching how KV
  stores are wired. Status lines report "added config label
  <label>" so operators see the parity.
- `single_store_kinds()` drops `"config"` and returns only
  `["secrets"]`: KV-backed config is multi-capable; secrets stay
  Single until native secret support lands.
- Scaffold `spin.toml.hbs` declares `key_value_stores =
  ["app_config"]` on the generated component so a fresh
  `edgezero new --adapter spin` is runnable without a manual
  provision pass.
- Delete the `[variables]`-backed code paths (`not_a_table_error`,
  `write_spin_variables`, 7 associated tests) and the
  `translate_key_for_spin` helper — provision no longer touches
  Spin variables for config. Add coverage for the KV-array write
  and the "multi-config now accepted, multi-secret still
  rejected" capability-gate split (`provision.rs` host tests).

Stage 5 gates: cargo fmt, host clippy
(--all-targets --all-features), cargo test --workspace
--all-targets, host check with `fastly cloudflare spin`, and
wasm clippy for fastly (wasm32-wasip1), cloudflare
(wasm32-unknown-unknown), and spin (wasm32-wasip2) all green.
Now that config lives in KV (arbitrary UTF-8 keys) and never
shares Spin's flat variable namespace, the validator pieces that
mirrored `[variables]` rules are obsolete:

- Delete Spin's `validate_app_config_keys` override + the
  `translate_key_for_spin` helper (and its 3 unit tests). The
  trait's `Ok(())` default applies; an `#[expect]` on the impl
  block documents why no impl is provided.
- Simplify Spin's `validate_typed_secrets`: drop the `.→__`
  config-key pre-population of the `seen` set. Secrets still
  resolve through Spin variables, so the within-`#[secret]`
  uniqueness + `is_valid_spin_key` canonicalisation checks stay.
- Update CLI tests: delete `spin_key_syntax_rejects_uppercase_*`,
  `spin_key_syntax_rejects_dash_in_key`,
  `spin_config_secret_collision_typed_only` (3 stale
  expectations). Rewrite `raw_push_runs_spin_key_validation_*`
  into `raw_push_runs_spin_adapter_manifest_check_*`: same
  regression intent (raw push must run `run_shared_checks` before
  dispatch), new probe (Spin's `[component.*]` discovery rather
  than the removed key rule).
- Spin adapter unit-test cleanup: remove
  `validate_app_config_keys_rejects_uppercase`,
  `validate_app_config_keys_rejects_dashes`,
  `validate_typed_secrets_detects_collision`,
  `validate_typed_secrets_detects_collision_after_lowercasing_secret_value`
  (all assert the deleted behavior); keep the secret-value
  canonicalisation + cross-secret collision tests intact.
- Update stale wording: the `Adapter::validate_app_config_keys`
  trait docstring no longer cites Spin's defunct rule; the
  `run_config_push_typed` and `ValidationContext` comments no
  longer cite "Spin key syntax" / `api-token` examples.

Stage 6 gates: cargo fmt, host clippy
(--all-targets --all-features), cargo test --workspace
--all-targets, host check with `fastly cloudflare spin`, and
wasm clippy on spin (wasm32-wasip2) all green.
User-facing docs and the reference app no longer describe Spin
config as `[variables]`-backed:

- `docs/guide/adapters/spin.md` — rewrite the Config Store
  section to describe the KV-backed flow (multi-store,
  `key_value_stores` declarations, seed-handler push). Trim the
  cross-namespace collision wording from the Secret Store
  section: KV config and Spin variables no longer share keys, so
  only the within-`#[secret]` canonicalisation check survives.
- `docs/guide/cli-reference.md` and `cli-walkthrough.md` — rewrite
  the spin row / bullet in the push table from "pure spin.toml
  editing + `.→__` translation" to "HTTP POST to
  `/__edgezero/config/seed`" with the full URL/token resolution
  chain. Drop the "Spin key syntax" bullet from the validate
  walkthrough.
- `docs/guide/configuration.md` — update the config-store
  adapter-behavior bullet for Spin: multi-store KV, labels
  declared in `key_value_stores`, seeded via `config push`.
- `examples/app-demo/crates/app-demo-adapter-spin/spin.toml` —
  drop `greeting`, `feature__new_checkout`, `service__timeout_ms`
  from `[variables]` (now in the `app_config` KV store via the
  seed handler) and add `app_config` to the component's
  `key_value_stores`. `[variables]` is now SECRETS-ONLY
  (`api_token`, `vault`, `smoke_secret`).
- `examples/app-demo/crates/app-demo-cli/tests/config_flow.rs` —
  thread `args.seed_url` through `push_args` for spin (dry-run
  still requires the URL to be resolvable). Update the
  byte-identical test's comment to point at the new in-adapter
  preview test. Delete the trait-poking
  `spin_dry_run_preview_lists_app_demo_translated_keys_and_both_tables`
  test: it bypassed the public CLI to inspect log lines, hand-
  built `AdapterPushContext` + `ResolvedStoreId`, and duplicated
  `edgezero_adapter_spin::cli::tests::push_dry_run_emits_url_and_entries_without_posting`.
- `scripts/smoke_test_config.sh` — update the comment that
  cited Spin's `[variables]` defaults to describe the new
  `config push --adapter spin --local` flow.

Stage 7 gates: cargo fmt + host clippy
(--all-targets --all-features) in both root and
`examples/app-demo` workspaces, `cargo test --workspace
--all-targets` in both, app-demo `cargo build -p
app-demo-adapter-spin --target wasm32-wasip2 --release`, plus
wasm clippy on spin (wasm32-wasip2), fastly (wasm32-wasip1),
cloudflare (wasm32-unknown-unknown) all green.
…eout

The `spin up` smoke test surfaced a gap the plan didn't
anticipate: Spin rejects component-declared `key_value_stores`
labels with "unknown key_value_stores label <name>" unless each
custom label (anything but `default`) is declared in a
`runtime-config.toml` that the Spin runtime can resolve to a
backend. Fix this end-to-end so scaffolded and demo projects are
runnable out of the box:

- Add `runtime-config.toml.hbs` scaffold template that declares
  the default `[stores.config].ids = ["app_config"]` label
  against Spin's SQLite-backed KV backend (`type = "spin"`).
  Register it as the fourth Spin scaffold file alongside
  `Cargo.toml`, `src/lib.rs`, and `spin.toml`.
- Update the spin adapter's `serve` command template from
  `spin up --from {crate_dir}` to
  `spin up --from {crate_dir} --runtime-config-file
  {crate_dir}/runtime-config.toml` so `edgezero serve --adapter
  spin` resolves the KV labels in scaffolded projects.
- Add `examples/app-demo/crates/app-demo-adapter-spin/runtime-config.toml`
  declaring `app_config`, `sessions`, and `cache` against the
  SQLite backend (matching the labels app-demo's `spin.toml`
  references), and update `examples/app-demo/edgezero.toml`'s
  `adapters.spin.commands.serve` to pass
  `--runtime-config-file`.
- Document the runtime-config requirement in
  `docs/guide/adapters/spin.md`: show the file shape, explain
  why custom labels need an entry, link to Spin's
  runtime-config docs for production backends
  (azure/redis/etc.), and clarify that `provision` does NOT
  touch this file.

Final verification gate ran cargo fmt, host clippy
(--all-targets --all-features), and `cargo test --workspace
--all-targets` in both the root and `examples/app-demo`
workspaces. Wasm clippy passed for spin (wasm32-wasip2), fastly
(wasm32-wasip1), and cloudflare (wasm32-unknown-unknown);
app-demo wasm release builds succeeded for all three. End-to-
end `spin up` smoke confirmed Spin's runtime-config resolves
all three KV labels (`[key_value_store.<label>: spin]`); the
remaining wasi-http version skew (`wasi:http/types@0.3.0-rc-
2026-03-15` not in Spin 3.6.3's linker) is unrelated to the
KV-config migration and is gated on Spin catching up to the
WASI HTTP rc the wasm component imports.

Also commit the v12 plan + spec as a record of the eight-stage
design + execution path.
Lands the review-pass fixes from the PR thread (security hardening
of the seed handler, correctness, API cleanup, test coverage) plus
the design document for the per-backend-push pivot that
SUPERSEDES the seed handler in the follow-up commits.

Why "supersedes": the seed handler at /__edgezero/config/seed is
a permanent EdgeZero-owned attack surface that ships in every
deployed Spin app even with the hardening below. The PR-thread
review (separate reviewer) raised the bigger question: Spin can
seed KV stores via Spin's own mechanisms (`spin cloud key-value
set` for Fermyon Cloud, direct SQLite for local) — we shouldn't
need our own HTTP endpoint at all. This commit ships the
hardening as a transitional improvement; the next commit drops
the handler entirely and the one after adds per-backend writers.
See `docs/superpowers/plans/2026-06-04-spin-per-backend-push.md`.

## Security hardening of the seed handler (transitional)

- **Pre-auth body cap (256 KiB)**: bounds the read surface so an
  unauthenticated POST can't OOM the runtime with a multi-MB body.
  Returns 413 before `serde_json::from_slice` runs. (H1)
- **Per-entry caps**: `entries.len() <= 1000`, `value.len() <= 64
  KiB`, both return 413 with the offending index + key named in
  the body. (H2)
- **Fail-closed token gate FIRST**: server token validation moves
  before the method/content-type gates so an unauthenticated
  attacker can't fingerprint the route by observing 405/415
  behaviour. GET-with-no-token now returns 401 (matches the
  `run_app_with_seeder` docstring contract). (N-M3)
- **422 body names BOTH index and key** of the failing entry so
  operators can trim earlier entries and retry. (H4)
- **`SpinKvSeedWriter::write_batch`**: trait method rewritten to
  open the KV store ONCE per batch instead of N times per entry.
  Also gains the `NoSuchStore` variant distinct from
  `WriteFailed`, mapped to 404 (label not declared in
  runtime-config.toml) vs 422 (transient write failure). (M3 + M4)
- **Tighter content-type matching**: rejects `application/json-bad`
  which the previous `starts_with` check accepted. (N-L1)
- **Drop wire-token length from mismatch log**: was a partial
  oracle on server-token length. (M1)
- **16-byte-floor doc clarification**: explicit "16 random bytes
  (e.g. `openssl rand -base64 16`)" wording — operators using
  hex-encoded tokens get half the entropy. (M2)
- **Reserved-path collision detection**: `Adapter::reserved_paths()`
  trait method; CLI rejects any `[[triggers.http]].path` matching
  an adapter's reserved path so user-declared handlers can't be
  silently shadowed by `run_app_with_seeder`. (H3)

## Correctness fixes (survive the pivot)

- **`ConfigStoreError::internal`** for `SpinSdkKvStore::open`
  failures: structural / permanent (label not declared), distinct
  from transient `unavailable`. `build_config_registry` uses
  `anyhow::Context::with_context` to preserve the chain instead
  of stringifying. (M4)
- **`spin-sdk` pinned to `~6.0`** so a 6.1.x signature or KV
  schema change is a build failure rather than a runtime mismatch.
  (M6)
- **`Adapter::merged_id_kinds()`** trait method: Spin overrides
  to `&["kv", "config"]`. CLI rejects logical-id overlap across
  merged kinds — same id under `[stores.kv].ids` and
  `[stores.config].ids` would silently share writes via one
  underlying KV label. (M7)

## API cleanup (survive the pivot)

- **Drop dead `_config_keys` parameter** from
  `Adapter::validate_typed_secrets`. No implementer used it
  post-Stage-6; every caller still computed the flattened key
  set. (M8)

## Test bug + coverage

- **Fix duplicate `err.contains("api-token")` assertion** in
  `validate_typed_secrets_rejects_invalid_spin_variable_in_secret_value`:
  the field name `api_token` (underscore) was never actually
  checked. (H5)
- **11 new tests for `resolve_adapter_push_ctx`** URL/token
  resolution chains: flag > env > manifest precedence (prod),
  flag > env > builtin fallback (local), the security-load-
  bearing manifest-bypass guarantee under `--local`, distinct
  prod vs local env vars, token-from-flag-or-env (never
  manifest). (H6)
- **2 new manifest tests** pinning the `seed-url` TOML key's
  serde rename: the dashed key populates `commands.seed_url`,
  the underscored form is silently ignored — docs/errors must
  point at the dashed form. (N-M2)
- **2 new reserved-path tests** asserting the
  `/__edgezero/config/seed` collision is rejected at
  `config validate` time. (H3)
- **2 new merged-id collision tests** asserting kv+config
  overlap on the same logical id is rejected. (M7)
- **6 new seed handler tests**: 401 fail-closed on GET-no-token
  and wrong-CT-no-token, 413 on oversized body / too many
  entries / oversized value, 422 with index+key naming. (H1/H2/
  H4/N-M3)

## Other fixes

- **`raw_push_runs_spin_key_validation_before_push`** rewritten
  as `raw_push_runs_spin_adapter_manifest_check_before_push`:
  the original probed Spin's deleted `^[a-z][a-z0-9_]*$` rule;
  the new test uses `[component.*]` discovery in spin.toml as
  the regression probe. Same intent (raw push runs shared
  checks before dispatch), new probe.
- **`--local` help text** rewritten to document Spin-specific
  semantics: `--local` switches the seed-URL resolution chain
  away from the manifest's prod URL and toward the local env
  var / builtin fallback. The manifest prod URL is NEVER
  consulted under `--local` so a misconfigured prod entry can't
  bleed into a local push. (N-L2)
- **Shared-token model documented** in `args.rs`: `--seed-token`
  has no LOCAL variant, so operators with both contexts open
  should set the env var to a value safe for both or pass the
  flag explicitly per push. (M5)
- **App-demo wired through `run_app_with_seeder`**: the
  scaffold was already using it; app-demo was still on plain
  `run_app`, which made the seed endpoint unreachable on the
  demo. Will be reverted in the next commit when the seeder is
  deleted entirely. (N-M1)

## Gates

cargo fmt + host clippy (--all-targets --all-features) + cargo
test --workspace --all-targets across root and `examples/app-demo`.
Wasm clippy green for spin (wasm32-wasip2), fastly (wasm32-wasip1),
cloudflare (wasm32-unknown-unknown). 354 root core tests + 108 cli
tests + 88 spin tests + 71 macros tests + 12 adapter tests + the
rest of the workspace; 26 app-demo tests; all green.

## Next commits

1. `spin: drop /__edgezero/config/seed handler (architecture
   pivot)` — deletes seed.rs, run_app_with_seeder, --seed-url /
   --seed-token, the seed-url manifest field, the reserved_paths
   trait method, and the resolve_adapter_push_ctx URL/token
   logic. Reverts the app-demo seeder wiring above. The hardening
   in this commit becomes historical (the file is deleted) but
   the work was real for the time the handler was the design.

2. `spin: per-backend writers (SQLite-direct + Fermyon Cloud
   shellout)` — implements the replacement: parse Spin's own
   runtime-config.toml, dispatch to a SQLite writer (vendoring
   Spin's exact `spin_key_value` schema with a byte-compare
   contract test) or shell `spin cloud key-value set` based on
   the backend type + auto-detected Fermyon Cloud deploy.
7 of 8 reviewer items from the June-02 batch — the eighth ("preserve
the historical root-level adapter registry API") is intentionally left
unaddressed: pulling the registry items back to the crate root would
require either a workspace-wide pub_use exception or a backward-
compatibility shim, and we'd rather have downstream adapters migrate
to `edgezero_adapter::registry::*` (the path every in-tree adapter
already uses) than carry a permanent allow.

Fixes:
- examples/app-demo/crates/app-demo-adapter-spin/src/lib.rs and
  crates/edgezero-adapter-spin/src/templates/src/lib.rs.hbs:
  spin_sdk::http_component expands to required WASI export glue
  (`__export_wasi_http_incoming_handler_0_2_0_cabi` produces an
  unsafe attribute + unsafe extern + unsafe block). Add a narrowly-
  scoped `#![allow(unsafe_code, reason = ...)]`. Verified the lint
  actually fires before adding the allow.
- crates/edgezero-adapter-cloudflare/src/templates/src/lib.rs.hbs:
  pass `include_str!("../../../edgezero.toml")` as the new first
  argument to `run_app::<…>`; the previous `(req, env, ctx)` call
  no longer compiles against the current `run_app` signature.
- .github/workflows/test.yml: wasmtime install now enforces the pinned
  version on every run — `.tool-versions` joins the cache key so a
  bump invalidates the cached binary, and the install step compares
  `wasmtime --version` against the pin and reinstalls on mismatch.
  Defends against both stale cache hits and runner-provided wasmtime.
- crates/edgezero-adapter-cloudflare/src/lib.rs and
  crates/edgezero-adapter-spin/src/lib.rs: `init_logger` is a no-op
  that always returns `Ok(())`. Updated the `# Errors` doc to say
  so, with a note that the Result signature exists so the future
  "wire in a real logger" branch is drop-in compatible.
- crates/edgezero-adapter-fastly/src/request.rs: `dispatch_with_config`
  logs+skips missing config stores rather than returning an error.
  Updated the `# Errors` doc to describe the actual error surface
  (request conversion / KV resolution / dispatch / response conversion).
The seed handler at `POST /__edgezero/config/seed` shipped on every
deployed Spin app via `run_app_with_seeder` — a permanent
EdgeZero-owned attack surface that even hardened (16-byte
constant-time tokens, 256 KiB body cap, 1000-entry/64 KiB caps,
fail-closed token-first ordering, etc., per the prior commit) is
still a liability we own forever. The PR-thread review made the
case that Spin already exposes the right primitives for KV
seeding (`spin cloud key-value set` for Fermyon Cloud; direct
SQLite for local) and we shouldn't need our own HTTP endpoint at
all.

This commit removes the handler and the surrounding CLI surface.
The replacement (per-backend writers reading Spin's own
`runtime-config.toml` to dispatch to SQLite-direct or
`spin cloud key-value set`) lands in the next commit on this
branch — `docs/superpowers/plans/2026-06-04-spin-per-backend-push.md`
spells out the design. Until then, `config push --adapter spin`
returns a clear "under restructure" error pointing at the plan
document so anyone running it (e.g., the app-demo integration
test that's `#[ignore]`d here) gets actionable next steps.

## Runtime side

- Delete `crates/edgezero-adapter-spin/src/seed.rs` (917 lines:
  the handler itself plus the 23 D9-status-code unit tests added
  in the prior commit, the `SeedWriter` trait, the
  `SpinKvSeedWriter` impl, the `InMemorySeedWriter` test harness,
  and the `MAX_BODY_BYTES` / `MAX_ENTRIES` / `MAX_VALUE_BYTES`
  caps. All of this becomes moot once we don't own an HTTP
  endpoint).
- Delete `run_app_with_seeder` from
  `crates/edgezero-adapter-spin/src/lib.rs` and the `mod seed`
  gate. Plain `run_app::<A>(req)` is the only public entrypoint
  again.
- Revert
  `examples/app-demo/crates/app-demo-adapter-spin/src/lib.rs`
  to call `run_app::<App>` (drops the wiring added in the prior
  commit).
- Revert
  `crates/edgezero-adapter-spin/src/templates/src/lib.rs.hbs`
  scaffold to call `run_app::<App>`. Generated projects no
  longer ship a seed endpoint.

## CLI side

- Delete `--seed-url`, `--seed-token` flags from
  `ConfigPushArgs`. Delete the related docstring paragraphs.
- Add `--runtime-config <PathBuf>` flag (default: adapter
  resolves a location, typically `runtime-config.toml` next to
  the adapter manifest). The per-backend writer will read this
  file to dispatch.
- Delete `seed_url`, `seed_token`, `with_seed_url`,
  `with_seed_token` from `AdapterPushContext`. Add
  `runtime_config_path: Option<&Path>` + builder.
- Delete `Adapter::reserved_paths` trait method (only user was
  Spin's seed route).
- Rewrite `resolve_adapter_push_ctx` to a 1-line function that
  passes through `--local` + `--runtime-config` without any
  URL/token resolution chain.
- Rewrite `dispatch_push` to use the new builder API. Drop
  `EDGEZERO__ADAPTERS__SPIN__SEED_*` env handling entirely
  (the env vars are gone).
- Delete the 11 `resolve_seed_*` unit tests added in the prior
  commit (Pass 6) — they tested URL/token resolution that no
  longer exists.
- Delete the 2 `spin_reserved_seed_*` and
  `spin_non_reserved_paths_*` tests + the
  `reject_reserved_path_collisions` helper.

## Manifest side

- Delete the `seed_url` field (and `rename = "seed-url"`) from
  `ManifestAdapterCommands`. Delete the 2 tests added in the
  prior commit (Pass 7) that pinned the rename.

## Spin adapter side

- Rewrite `Adapter::push_config_entries` /
  `push_config_entries_local` impls as stubs that return a
  pointed error ("under restructure; per-backend writers land in
  the next commit"). Both methods stay so the trait signatures
  remain satisfied; the real implementations land in Commit 3.
- Delete `Adapter::reserved_paths` impl.
- Delete `build_seed_payload` and the 4 push tests
  (`push_with_no_entries_*`, `push_dry_run_emits_url_*`,
  `push_errors_when_seed_url_unset_prod`,
  `push_errors_when_seed_url_unset_local_names_local_env_var`)
  + 2 `build_seed_payload_*` tests.
- Drop the `reqwest::blocking::Client as HttpClient` import (no
  more HTTP POST).
- Rewrite `raw_push_runs_spin_key_validation_before_push`'s
  docstring to drop the stale `api-token` reference (the test
  body already probes `[component.*]` discovery, not the deleted
  key rule).

## App-demo + scaffold

- App-demo's `config_push_spin_dry_run_dispatches_cleanly_and_preserves_manifest`
  integration test is `#[ignore]`-d with a pointer to
  `2026-06-04-spin-per-backend-push.md`. It gets rewritten in
  Commit 3 against a SQLite round-trip in a temp
  `.spin/sqlite_key_value.db`.
- `raw_push_spin_dry_run_dispatches_to_adapter` in CLI tests
  same treatment: body becomes a comment pointing at the plan,
  `#[ignore]` so the suite stays green.

## Docs + scripts

- `docs/guide/adapters/spin.md` Config Store section's push
  subsection rewritten to a `::: warning Push under restructure`
  callout pointing at the plan document. The rest of the section
  (KV-backed config model, runtime-config.toml requirement,
  multi-store via `[stores.config].ids`) stays — KV runtime
  reads are unchanged; only the writeback path is restructuring.
- `docs/guide/cli-reference.md` and `cli-walkthrough.md` spin
  rows / bullets rewritten with the same restructure callout.
- `scripts/smoke_test_config.sh` comment updated: the
  references to the seed handler become "SQLite write into
  `.spin/sqlite_key_value.db` once the per-backend writer
  lands".

## Net diff

14 files, 108 insertions, 1903 deletions. Most of the deletions
are seed.rs (917 lines) + the Pass 1-7 hardening + tests that
hardened the handler before we decided to retire it. Honest
history: that work was real for the time the handler was the
design; now the design changed.

## Gates

- `cargo fmt --all -- --check` — green.
- `cargo clippy --workspace --all-targets --all-features
  -- -D warnings` — green.
- `cargo test --workspace --all-targets` — 5 root crate test
  result blocks green (138 axum + 352 core + 41 cloudflare +
  43 fastly + 12 adapter + 94 cli + 58 spin + others), 1 test
  `#[ignore]`d (`raw_push_spin_dry_run_dispatches_to_adapter`),
  zero failures.
- App-demo workspace: 26 + 3 (1 ignored) + 1 + 0×6 — green.
- Wasm clippy: spin (`wasm32-wasip2`), fastly
  (`wasm32-wasip1`), cloudflare (`wasm32-unknown-unknown`) all
  green.

## Next commit

`spin: per-backend writers (SQLite-direct + Fermyon Cloud
shellout)` — implements `push_config_entries` for real:
parses `runtime-config.toml`, dispatches based on backend
`type`. SQLite path vendors Spin's exact `spin_key_value`
schema with a byte-compare contract test against the upstream
source. Fermyon Cloud path shells `spin cloud key-value set`
per entry, auto-detected from `[adapters.spin.commands].deploy
= "spin deploy"` (suppressed by `--local`).
Implements the per-backend `config push --adapter spin` dispatch
that the previous commit's deletion left as a stub. No HTTP
endpoint, no EdgeZero-owned attack surface in deployed apps —
just direct backend writes via the runtime-config-declared
adapter.

## Architecture

`crates/edgezero-adapter-spin/src/cli/` (new submodule):
- `runtime_config.rs` — parses `runtime-config.toml`'s
  `[key_value_store.<label>]` stanzas. Recognises `type = "spin"`
  (local SQLite), `type = "redis"`, `type = "azure_cosmos"`, and
  preserves anything else as `Unknown { type_name }` so the
  dispatcher can name the unrecognised type in its error.
- `push_sqlite.rs` — SQLite-direct writer using rusqlite. Vendors
  Spin's exact `spin_key_value(store, key, value)` schema and
  `INSERT … ON CONFLICT DO UPDATE` statement from
  spinframework/spin's `crates/key-value-spin/src/store.rs`. One
  transaction per batch; creates file + parent dir + schema if
  missing (matches Spin's runtime first-read behaviour).
- `push_cloud.rs` — Fermyon Cloud shellout. Shells `spin cloud
  key-value set --store <label> <key> <value>` per entry,
  capturing stderr. Detects "not logged in" specifically and
  points the operator at `spin cloud login`. Auto-detection from
  `[adapters.spin.commands].deploy` containing `spin deploy` /
  `spin cloud deploy`.

`dispatch_push` (in `cli.rs`) decides which writer to use:

1. `--local` set → SQLite-direct (forces local even if manifest
   deploy command would trip Fermyon Cloud auto-detect; lets the
   operator push without authenticating against Fermyon Cloud).
2. Else if `manifest_adapter_deploy_cmd` contains a Fermyon
   Cloud deploy hint → `spin cloud key-value set` shellout.
3. Else dispatch on `runtime-config.toml`'s
   `[key_value_store.<label>].type`:
   - `type = "spin"` (or no stanza) → SQLite-direct.
   - `type = "redis"` → error pointing at
     `redis-cli -u <url> SET <key> <value>`.
   - `type = "azure_cosmos"` → error pointing at the Azure CLI.
   - `Unknown { type_name }` → error naming the type so the
     operator can plan accordingly.

## Schema-drift protection

`push_sqlite::SPIN_KV_CREATE_TABLE` and `SPIN_KV_SET` are
vendored byte-for-byte from spinframework/spin's
`crates/key-value-spin/src/store.rs`. A unit test
(`vendored_schema_matches_upstream_byte_for_byte`) byte-equals
each constant against the upstream string; a second
(`vendored_schema_creates_table_with_expected_column_shape`)
runs `PRAGMA table_info` and asserts the resulting column
shape matches Spin's expected
`(store TEXT, key TEXT, value BLOB)` PRIMARY KEY `(store, key)`.

Combined with `Cargo.toml`'s `spin-sdk = "~6.0"` pin, this
catches drift two ways: our vendored copy diverging from
upstream (byte-compare test fails), or Spin shipping a 6.1.x
that touches the schema (semver pin blocks the build).

## API surface changes

- `AdapterPushContext` gains
  `manifest_adapter_deploy_cmd: Option<&'ctx str>` and a builder
  method (`with_manifest_adapter_deploy_cmd`). Threaded through
  from CLI's `dispatch_push` (which now reads
  `adapter_cfg.commands.deploy` and populates the field).

## Templates / scaffold

- `templates/spin.toml.hbs`: dropped the stale "seed handler"
  comment; replaced with "writes directly into the SQLite
  backend declared for it in runtime-config.toml, or shells
  `spin cloud key-value set` when deploying to Fermyon Cloud".
- `templates/runtime-config.toml.hbs`: corrected the example
  managed-backend type name (`azure_cosmos`, not `azure`) and
  added a paragraph stating that the current dispatcher
  supports `type = "spin"` and points other types at their
  native CLIs.
- `crates/edgezero-cli/src/templates/root/gitignore.hbs`: now
  also ignores `.wrangler/`, `.spin/`, and `.edgezero/` so
  scaffolded projects don't commit local emulator state. The
  EdgeZero repo's own `.gitignore` already did this; the
  scaffold was missing it.

## Tests

- 19 new spin-adapter unit tests across the three new files
  (runtime-config parser variants + missing file + malformed
  TOML, SQLite round-trip / overwrite / store-isolation /
  default-path / explicit-path resolution, vendored-schema
  byte-equal and PRAGMA shape, deploy-command Fermyon-Cloud
  detection, etc.). Spin adapter is now at 77 tests (up from
  58 after Commit 2's deletions).
- App-demo integration test
  `config_push_spin_writes_sqlite_round_tripped_via_rusqlite`
  (re-enabled, no longer `#[ignore]`-d): drives the full typed
  flow through `run_config_push_typed::<AppDemoConfig>` against
  a temp project with a `runtime-config.toml` selecting
  `type = "spin"`, then re-opens the resulting
  `.spin/sqlite_key_value.db` via rusqlite and asserts the
  flattened, secret-stripped entries landed. Pins:
  - `greeting` lands verbatim;
  - `service.timeout_ms` lands with the nested-table dotted key;
  - boolean `feature.new_checkout` flattens to "false";
  - `#[secret]` `api_token` is stripped from the payload;
  - `#[secret(store_ref)]` `vault` is stripped too.

## Docs

- `docs/guide/adapters/spin.md` Config Store → Seeding the
  store: replaced the Commit 2 "under restructure" placeholder
  with the real per-backend resolution order, the schema-
  coupling note (vendored CREATE TABLE + drift test +
  `spin-sdk` pin), and the local/cloud usage examples.
- `docs/guide/cli-reference.md` spin row in the push table:
  replaced placeholder with the actual dispatch rules.
- `docs/guide/cli-walkthrough.md` spin bullet: same.

## Gates

- `cargo fmt --all -- --check` — green.
- `cargo clippy --workspace --all-targets --all-features
  -- -D warnings` — green. Required two `#![expect]` opt-outs
  in `cli.rs`: `self_named_module_files` (workspace policy
  denies both `self_named_*` and `mod_module_*`, which
  contradict; repo convention is the self-named form) and
  `arbitrary_source_item_ordering` (the strict-ordering lint
  disagrees with the conventional placement of `mod`
  declarations after `use` blocks).
- `cargo test --workspace --all-targets` — green. 352 core +
  138 axum + 94 cli + 77 spin + 43 cloudflare + 41 fastly +
  others = ~1100 tests, zero failures.
- App-demo workspace tests — green, including the new
  SQLite round-trip integration test.
- Wasm clippy on spin (wasm32-wasip2), fastly (wasm32-wasip1),
  and cloudflare (wasm32-unknown-unknown) — all green.
  `rusqlite` is gated behind `[target.'cfg(not(target_arch =
  "wasm32"))'.dependencies]` so wasm builds never link it.
Five fixes against the per-backend writer redesign, surfaced by
the reviewer's deep-dive verification pass:

## F1 (blocker): `--local` now forces SQLite-direct unconditionally

Previously the dispatcher's `if !push_ctx.local && fermyon_cloud
_detect(...)` only short-circuited the Fermyon Cloud auto-detect.
After that early return, the runtime-config backend match still
ran -- so `--local` against `[key_value_store.app_config] type =
"redis"` printed the redis-cli error instead of writing local
SQLite, despite docs claiming `--local` "forces SQLite-direct".

The new dispatcher returns `write_sqlite(...)` immediately when
`push_ctx.local` is set. If the runtime-config DOES declare
`type = "spin"` with an explicit `path`, we honour that path; for
any other backend type we silently fall through to Spin's default
`.spin/sqlite_key_value.db`. Behaviour now matches the docs across
4 source files (adapters/spin.md, cli-reference.md, cli-walkthrough.md,
args.rs).

Three dispatch-matrix tests pin the override:
- `dispatch_push_local_forces_sqlite_even_when_runtime_config_declares_redis`
- `dispatch_push_local_forces_sqlite_even_when_runtime_config_declares_azure`
- `dispatch_push_local_forces_sqlite_even_when_deploy_targets_fermyon_cloud`

## F2: Platform-label collision check (not just logical ids)

`reject_merged_id_collisions` previously rejected only logical-id
overlap (`[stores.kv].ids = ["x"]` + `[stores.config].ids = ["x"]`).
But `EDGEZERO__STORES__KV__SESSIONS__NAME=shared` +
`EDGEZERO__STORES__CONFIG__APP_CONFIG__NAME=shared` resolve two
distinct logical ids to the SAME Spin KV label at runtime --
re-creating the silent-shared-writes bug the check was meant to
prevent.

The check now resolves each (kind, logical_id) pair through
`EnvConfig::store_name(kind, id)` and tracks platform labels in
a separate map; second appearance of the same platform label
across merged kinds errors. The function gains an
`env_config: &EnvConfig` parameter and the caller reads
`EnvConfig::from_env()` once per validation.

Test: `spin_distinct_logical_ids_collide_when_env_overlay_resolves_to_same_platform_label`.

## F3: Spin runtime-version compatibility check

The byte-compare schema-drift test was self-referential (compared
to a literal in the same file). The `spin-sdk = "~6.0"` pin only
covers the build-time SDK, not the operator's installed Spin CLI
/ runtime. Spin's docs explicitly warn the SQLite file format is
"subject to change".

`push_sqlite::verify_spin_runtime_compat` shells `spin --version`
once per session before the first SQLite-direct write, parses the
major version, and `log::warn!`s if it's outside
`VERIFIED_SPIN_MAJOR_RANGE = &[2, 3]`. Never blocks (Spin is
optional from the writer's perspective; CI without Spin still
works). The module docstring now spells out all three layered
guards (vendored constants + build-time SDK pin + run-time CLI
check) and explicitly names what they CANNOT catch (a point-
release schema change within the same major + same CLI version).

Four tests pin the parser:
- handles the canonical `spin 3.6.3 (sha date)` format
- handles `spin-cloud 0.11.0` hyphenated prefix
- returns None for unrecognised stdout
- parses double-digit major versions defensively

## F4: Clean stale docs / comments

- `docs/guide/configuration.md:201-205`: still described Spin push
  as POSTing to `/__edgezero/config/seed`. Replaced with the
  per-backend dispatch summary and a link to the spin adapter
  guide's Seeding the store section.
- `crates/edgezero-adapter/src/registry.rs:253`: trait docstring
  on `push_config_entries` still mentioned Spin's
  `.` -> `__` key translation (removed in Stage 6 of the original
  KV migration). Rewritten to drop that example.
- `crates/edgezero-cli/src/config.rs:3`: module header still
  named "Spin key-syntax / component-discovery rules" and "Spin
  config/secret collision check" -- both removed (Stage 6).
  Replaced with the actual current shape ("per-adapter validators
  (`[component.*]` discovery for Spin, etc.)").

## F5: Real dispatch tests; un-stub the empty CLI test

The redesign deleted the seed-handler dispatch tests and left
`raw_push_spin_dry_run_dispatches_to_adapter` as an empty
`#[ignore]`d body -- effectively zero CLI-level coverage that
`config push --adapter spin` even reaches Spin's dispatcher.

11 new dispatch-matrix tests in `adapter-spin/src/cli.rs`'s test
mod pin every branch of `dispatch_push`:
- empty-entries no-op
- 3 `--local`-forces-SQLite cases (vs Redis / Azure / Fermyon
  Cloud auto-detect) -- F1 verification
- `--local` honours explicit Spin path
- Fermyon Cloud auto-detect from `spin deploy` deploy command
- Redis backend errors with redis-cli hint + url
- Azure backend errors with az-cosmosdb hint
- Unknown backend errors with the type name
- Default branch -> SQLite at `.spin/sqlite_key_value.db`
- `--runtime-config <path>` flag honoured (was test-coverage gap H2)
- Unrelated label in runtime-config doesn't block the matching
  label's dispatch

The empty CLI stub is re-implemented to drive a raw `--local`
dry-run through `run_config_push` end-to-end and assert spin.toml
stays byte-identical (the per-backend writer never edits it).

## Gates

cargo fmt + host clippy (--all-targets --all-features) + cargo
test --workspace --all-targets all green. Wasm clippy on spin
(wasm32-wasip2) green. App-demo workspace tests green.

Spin adapter test count: 93 (was 77, +16: 11 dispatch matrix +
4 version parser + 1 the test-mod helper shape). CLI test count:
96 (was 94, +2 for env-overlay platform-label collision +
un-stubbed CLI dispatch test).

Net diff: +674 / -45 lines across 5 files.
… provision collision check

Five fixes against the per-backend dispatcher, against the
reviewer's second-round findings on tip 0be7444.

## H1 (production blocker): Fermyon Cloud command shape was wrong

The `set` subcommand in fermyon/cloud-plugin's
`src/commands/key_value.rs` takes:

  spin cloud key-value set --store STORE KEY=VALUE [KEY=VALUE ...]

Key/value pairs are POSITIONAL arguments in `key=value` form
(parsed via `spin_common::arg_parser::parse_kv`) and the command
accepts MULTIPLE pairs per invocation. The previous shape (`--store
STORE KEY VALUE`, one shellout per entry) would fail upstream
arg-parsing and probably target the wrong concept.

Push_cloud now:
- Formats each entry as `key=value`, refusing `=` in keys
  (`parse_kv` splits on the FIRST `=` so a key containing `=`
  would silently truncate).
- Batches entries into chunks under a 96 KiB argv budget per
  invocation (well below typical `ARG_MAX`) — a 1000-entry push
  becomes 1 or 2 shellouts, not 1000.
- Updates the dry-run preview wording at `cli.rs:551`,
  `cli-reference.md:248`, and `runtime-config.toml.hbs:20` to
  reflect the corrected shape.

Seven new tests pin the shape:
- `format_pair_emits_key_equals_value`
- `format_pair_allows_equals_in_value`
- `format_pair_rejects_equals_in_key`
- `chunk_entries_packs_single_chunk_when_small`
- `chunk_entries_handles_empty_slice`
- `chunk_entries_splits_when_aggregate_exceeds_cap`
- `chunk_entries_rejects_oversized_single_pair`

## H2: Non-default labels now require a runtime-config stanza

Spin auto-provides ONLY the `default` KV label. Any other label
must have a `[key_value_store.<label>]` entry in
`runtime-config.toml` or `spin up` errors with "unknown
key_value_stores label X" and the SQLite file we just wrote is
unreadable from the running app.

The previous dispatcher fell through to SQLite-direct for any
absent label — so `app_config` could be pushed "successfully" to
.spin/sqlite_key_value.db while the running spin app fails at
`Store::open("app_config")`.

`verify_label_declared` now checks BOTH the `--local`-forced
branch AND the default branch:
- `default` label → fall through to SQLite (Spin auto-provides).
- Label with stanza → fall through to SQLite.
- Non-default label WITHOUT stanza → hard error naming the
  missing stanza, the runtime symptom Spin would emit, AND the
  exact line to add to runtime-config.toml.

Two new tests:
- `dispatch_push_default_label_with_no_runtime_config_dispatches_to_sqlite`
  (the `default` exception still works)
- `dispatch_push_non_default_label_without_runtime_config_stanza_errors`
  (the new error path)
- `dispatch_push_non_default_label_with_runtime_config_stanza_dispatches_to_sqlite`
  (counterpart to the error case)

Updated three pre-existing dispatch tests to declare the
runtime-config stanza they were silently relying on.

## M1: `provision --adapter spin` now runs the same env-overlay collision check

The env-resolved platform-label collision check landed in `config
validate` in commit 0be7444 but `provision` had its own pre-
dispatch flow that didn't call it. Result: an operator with
`EDGEZERO__STORES__KV__SESSIONS__NAME=shared` +
`EDGEZERO__STORES__CONFIG__APP_CONFIG__NAME=shared` saw `config
validate` exit 1 but `provision --adapter spin --dry-run` exit 0
and emit two label writes that both land on the same store.

- `reject_merged_id_collisions` is now `pub(crate)` so
  `provision.rs` can call it.
- The call lives between the `validate_adapter_manifest` hook
  and the `resolve_kind` env-resolution block, so it fires
  unconditionally before any platform-label resolution.
- New test
  `run_provision_spin_rejects_env_overlay_platform_label_collision_across_kv_and_config`
  pins parity with the `config validate` regression added in
  0be7444.

## L1: Stale docs cleaned

- `docs/guide/cli-reference.md:281`: the spin provision row said
  "Config and secret ids are intentionally not handled here" --
  out of date since Stage 5 of the KV-config migration, when
  provision started writing config ids too. Rewritten.
- `docs/guide/cli-walkthrough.md:110`: same paragraph; same fix.
- `docs/guide/configuration.md:201` was already fixed in 0be7444;
  spot-check confirms.
- `runtime-config.toml.hbs:20`: scaffold comment said push "only
  dispatches to local SQLite" -- stale since the Fermyon Cloud
  writer landed. Rewritten to name all three dispatch branches
  (SQLite-direct, `spin cloud key-value set` for auto-detected
  cloud, native-CLI errors for redis / azure_cosmos / unknown).

## L2: `manifest_guard` added to the F2 env-overlay test

The F2 test sets process-global `EDGEZERO__STORES__*` env vars
without serialising against other env-mutating tests. Per
`test_support.rs:137` docs, every env-mutating test should hold
the manifest mutex before the `EnvOverride` guards drop. Added.

## Gates

- cargo fmt + host clippy (--all-targets --all-features) green.
- cargo test --workspace --all-targets green:
  - Spin adapter: 102 (was 93; +9 across H1 chunker + H2
    stanza-required branches).
  - CLI: 97 (was 96; +1 for the M1 provision regression).
- Wasm clippy on spin (wasm32-wasip2) green.
- App-demo workspace tests green.

The reviewer's earlier `cargo test -p edgezero-cli
raw_push_spin_dry_run_dispatches_to_adapter -- --ignored`
invocation now passes WITHOUT `--ignored` (the stub is real,
asserts spin.toml byte-identical post-dispatch, and was extended
to write the required runtime-config stanza).
…l, docs

Three fixes against the per-backend dispatcher, against the
reviewer's third-round findings on tip 7dd6ab6.

## Blocker: Parallel test env leakage

`cargo test -p edgezero-cli spin` failed under default
parallelism because the F2 collision test sets
`EDGEZERO__STORES__*__NAME=shared` (under manifest_guard) while
unrelated tests run `run_config_push` / `run_config_validate` in
parallel WITHOUT the guard. The unguarded tests read process env
mid-flight and see `shared`, then fail the new H2 "non-default
label without runtime-config stanza" check.

Audit + fix: 24 tests in config.rs that hit
`run_config_validate*` / `run_config_push*` now hold the
`manifest_guard` for the duration of the at-risk call. Existing
provision tests already held it (12 sites unchanged). Pattern
matches the documented invariant in `test_support.rs:137`:
"every test that touches process env must hold the guard".

Stress-tested 5 sequential `cargo test -p edgezero-cli` runs
under default parallelism: 5/5 pass at 97/97.

## H: Fermyon Cloud push now uses --app + --label, not --store

Per [fermyon/cloud-plugin's `key_value.rs`](https://github.com/fermyon/cloud-plugin/blob/main/src/commands/key_value.rs)
`SetCommand`, the `set` subcommand has two mutually-exclusive
addressing modes:
- `--store STORE` — target the cloud KV store by its actual
  resource name. Requires knowing the cloud-side resource.
- `--app APP --label LABEL` — target the cloud KV store via the
  app-scoped label that's mapped to it. Matches Fermyon's
  [label model](https://developer.fermyon.com/cloud/linking-applications-to-resources-using-labels).

EdgeZero's `store.platform` is the env-resolved Spin label
written into `spin.toml`'s `key_value_stores`, NOT the cloud-
side KV resource name. The previous `--store <platform>` shape
conflated the two: if an operator linked label `app_config` →
store `prod-config` in Fermyon Cloud, our writer was seeding
`prod-config` only when the operator had literally named the
label and the store the same.

The corrected shape: `--app APP --label LABEL KEY=VALUE …`,
where `APP` comes from `spin.toml`'s `[application].name` and
`LABEL` is the env-resolved platform label. Operators pre-link
the label to a cloud KV store via `spin cloud link key-value`
(or the dashboard); the dispatcher detects the
"label not linked" stderr and suggests the link command.

Implementation:
- `push_cloud::write_batch(app_name, label, entries)` takes the
  app name as a new first parameter.
- `dispatch_push` reads `[application].name` from spin.toml
  before calling the cloud writer. Missing `[application].name`
  produces an actionable error (rather than silently shelling
  `set --app  --label …` which would fail upstream with an
  unhelpful clap error).
- New helper `read_spin_application_name` mirrors the existing
  `resolve_spin_component` pattern.

Three new tests pin the corrected shape + actionability:
- `dispatch_push_fermyon_cloud_auto_detects_from_spin_deploy_and_uses_app_label_shape`
  asserts the dry-run preview includes `--app x --label app_config`
  and does NOT include `--store`.
- `dispatch_push_fermyon_cloud_errors_when_spin_application_name_missing`
  pins the actionable error.
- The cloud writer's "not linked" branch is now exercised via
  the `not linked` / `no store linked` / generic `link` stderr
  classification.

## L (medium): Stale docs

- `docs/guide/adapters/spin.md:158-174`: rewrote points 1-4 of
  the "Seeding the store" resolution order to reflect ALL three
  recent semantic changes:
  - `--local` requires runtime-config stanzas for non-default
    labels (from earlier round);
  - Fermyon Cloud writer uses `--app <APP> --label <LABEL>
    KEY=VALUE` shape with chunking semantics named explicitly;
  - default branch only auto-fallback for `default` label.
- `docs/guide/cli-reference.md:248`: same updates to the spin
  row of the push table.
- `docs/guide/cli-walkthrough.md:179-198`: same updates to the
  spin bullet, including link to Fermyon's label model docs.

## Gates

- cargo fmt + host clippy (--all-targets --all-features) green.
- cargo test --workspace --all-targets green: spin adapter at
  103 (was 102, +1 for the cloud-shape + app-name-required
  tests collapsed), CLI at 97 (env tests now consistently
  serialize).
- 5/5 stress runs of `cargo test -p edgezero-cli` under default
  parallelism all 97/97 green.
- Wasm clippy on spin (wasm32-wasip2) green.
- App-demo workspace tests green.

The reviewer's failing invocation `cargo test -p edgezero-cli
spin` (default parallelism) now passes deterministically.
…in tests

Three fixes against the reviewer's fourth-round findings on tip
762c426.

## F1 (medium): `link key-value` hint suggested wrong syntax

The previous hint:

  spin cloud link key-value --app <APP> --label <LABEL> <store>

is invalid. Per fermyon/cloud-plugin's
`src/commands/link.rs::KeyValueStoreLinkCommand`, the actual
shape is:

  spin cloud link key-value --app <APP> --store <STORE> <LABEL>

Where the LABEL is positional (no `--label` flag), and `--store`
takes the cloud KV resource name. The `link` and `set` commands
have ASYMMETRIC argument shapes — `set` uses `--label`, but
`link` does NOT.

The fix-suggestion path is the path operators will need most
when first linking; getting it wrong defeats the actionable
purpose of the hint. Corrected to the verified upstream shape.

## F2 (low): Scaffold runtime-config.toml.hbs still showed old Cloud command

The implementation switched to `--app <APP> --label <LABEL>
KEY=VALUE` in commit 762c426, and `docs/guide/` was updated
alongside. The scaffold template's comment (line 24) was
missed: newly scaffolded projects would carry stale `--store
<label> KEY=VALUE …` wording.

Rewritten to reflect the actual shape AND the link command
operators need to run before the first push.

## F3 (low): Hermetic mock-spin tests for actual argv

`chunk_entries` + `format_pair` cover the per-pair / chunking
logic in isolation, but they don't prove `write_batch`
assembles the exact argv. Past command-shape regressions
(`--store` → `--app/--label`) would have been caught by an
end-to-end argv test against a fake `spin` binary.

Four new tests stand up a tempdir with a `spin` script that
captures its argv via `printf '%s\n' "$arg"` and stderr via
`cat stderr.txt`, prepend the dir to `PATH` under a per-test
mutex, and assert:

1. `write_batch_assembles_app_label_keyvalue_argv_against_a_mock_spin`
   — exact argv shape: `[cloud, key-value, set, --app, my-app,
   --label, app_config, greeting=hello, svc.timeout=1500]`.

2. `write_batch_translates_not_logged_in_stderr_to_actionable_error`
   — fake spin exits 1 with "not logged in" stderr; the wrapped
   error suggests `spin cloud login`.

3. `write_batch_translates_unlinked_stderr_to_actionable_link_hint`
   — fake spin exits 1 with "label `app_config` is not linked to
   a store" stderr; the wrapped error suggests the CORRECTED
   `link key-value --app ... --store <store-name> app_config`
   shape AND does NOT contain `--label` in the link-command
   region (specifically scoped to avoid false-positive matches
   against the failing SET command which legitimately uses
   `--label`).

4. `write_batch_chunks_large_batch_into_multiple_invocations_against_mock_spin`
   — same fixture as the existing chunker unit test (7 × ~30
   KiB), but verifies the actual mock-spin invocation count
   matches the chunker's chunk count, proving the loop in
   `write_batch` actually shells once per chunk.

The tests are `#[cfg(unix)]` because the mock relies on a
`#!/bin/sh` script and chmod +x. A separate `path_mutation_guard`
mutex serializes them so two parallel mock tests don't race on
`PATH`. Stderr payloads contain backticks and `$` characters
that would be reinterpreted by the shell, so the script reads
stderr from a file rather than interpolating it into the script
body.

## Gates

- cargo fmt + host clippy (--all-targets --all-features) green.
- cargo test --workspace --all-targets green: spin adapter
  jumps to 107 tests (was 103, +4 hermetic mock-spin tests).
- Wasm clippy on spin (wasm32-wasip2) green (the new mock
  infrastructure is `#[cfg(unix)] #[cfg(test)]`-gated so it
  doesn't ship to wasm).
- App-demo workspace tests green.
Brings in PR #257 review-feedback fixes (e788714) on top of the
extensible-CLI / per-backend `config push` work. Conflicts resolved
in three files — all by keeping HEAD where upstream targeted
APIs/forms that this branch has since superseded:

- crates/edgezero-adapter-fastly/src/request.rs
  Upstream re-touched `dispatch_raw`/`dispatch_with_config`/
  `dispatch_with_config_handle` doc-strings; this branch's
  9d31015 Hard-cutoff pass deleted those functions. Kept HEAD —
  the block stays removed.
- crates/edgezero-adapter-spin/src/templates/src/lib.rs.hbs
- examples/app-demo/crates/app-demo-adapter-spin/src/lib.rs
  Upstream switched to an unconditional `#![allow(unsafe_code, …)]`
  with `spin_sdk::http_component` wording. This branch is already
  on Spin SDK 6 (`#[http_service]` + `Request`), so kept HEAD's
  `cfg_attr(target_arch = "wasm32", allow(unsafe_code, reason = …))`
  form which both narrows the allow to wasm builds and references
  the macro this branch actually uses.

Auto-merged without conflict: .github/workflows/test.yml,
crates/edgezero-adapter-cloudflare/src/lib.rs,
crates/edgezero-adapter-cloudflare/src/templates/src/lib.rs.hbs,
crates/edgezero-adapter-spin/src/lib.rs.

Verified on the merged tree:
- cargo fmt --all -- --check
- cargo clippy --workspace --all-targets --all-features -- -D warnings
- cargo test --workspace --all-targets (865 passed)
- cargo clippy -p edgezero-adapter-spin --target wasm32-wasip2 …
- cargo clippy -p edgezero-adapter-fastly --target wasm32-wasip1 …
- cargo clippy -p edgezero-adapter-cloudflare --target wasm32-unknown-unknown …
- cd examples/app-demo && cargo test --workspace --all-targets
…s cleanup

Addresses the June-05 PR #257 review.

1. Important — Spin adapter CLI tests are no longer hermetic under
   parallel execution. The `push_sqlite::write_batch` writer shells
   `spin --version` once-per-process via `verify_spin_runtime_compat`.
   When `push_cloud`'s tests prepend a fake `spin` to `$PATH` (guarded
   only by a module-local mutex), a concurrently-running push_sqlite
   test's first `write_batch` can hit that fake spin and append
   `--version` into the cloud test's argv log, failing the cloud
   assertion and poisoning the mutex.

   Fix: early-return from `verify_spin_runtime_compat` under
   `cfg!(test)`. The function is best-effort warning logic with no
   production semantic impact, and its parser is unit-tested
   independently, so dropping it in tests doesn't lose coverage.
   `cfg!()` is a const expression (not a `#[cfg(not(test))]`
   attribute) so it doesn't trip strict-clippy's `cfg_not_test`.
   `cfg!(test)` resolves only for THIS crate's test target, so the
   shellout still runs when `write_batch` is called from production
   code or from downstream crates' tests (e.g. `app-demo-cli`).

2. Medium — `dispatch_push` parsed `runtime-config.toml` before
   branching, so a malformed local runtime-config blocked even
   Fermyon Cloud `--dry-run` previews — even though the cloud path
   only needs `[application].name` from `spin.toml`.

   Restructure so the cloud branch never reads runtime-config: keep
   the path math at the top, read inside `--local`, skip read in the
   cloud branch, read again in the SQLite-direct fallthrough.
   Regression covered by
   `dispatch_push_fermyon_cloud_dry_run_ignores_malformed_runtime_config`
   which seeds the tempdir with `this is not [valid toml` and asserts
   the cloud preview still renders.

3. Low — `edgezero config push`'s CLI reference omitted `--local`
   and `--runtime-config`. Added both to the synopsis and to the
   argument list, calling out that `--local` is Spin/Fastly/CF and
   `--runtime-config` is Spin-only (and explicitly noting cloud
   pushes don't consult it).

4. Low — stale wording in:
   - `docs/guide/adapters/spin.md`: example showed
     `type = "azure"` for the managed-backend swap, but the parser
     only recognises `azure_cosmos`. Changed to `azure_cosmos`.
   - `crates/edgezero-adapter-spin/src/templates/spin.toml.hbs`:
     the `key_value_stores = ["app_config"]` comment claimed
     `app_config` was the default `[stores.config].ids` declared in
     the generated `edgezero.toml`, but that section is
     commented-out by default. Reworded to reflect the
     opt-in-default model (uncomment in edgezero.toml to wire it
     up; delete here + in runtime-config.toml to disable).

Verified on this branch (all gates green):
- cargo fmt --all -- --check
- cargo clippy --workspace --all-targets --all-features -- -D warnings
- cargo test --workspace --all-targets
- cargo clippy -p edgezero-adapter-spin --target wasm32-wasip2 --features spin --all-targets -- -D warnings
- cargo clippy -p edgezero-adapter-fastly --target wasm32-wasip1 --features fastly --all-targets -- -D warnings
- cargo clippy -p edgezero-adapter-cloudflare --target wasm32-unknown-unknown --features cloudflare --all-targets -- -D warnings
- cd examples/app-demo && cargo test --workspace --all-targets
- (cd docs && npx prettier --check guide/cli-reference.md guide/adapters/spin.md)
…, refresh stale Spin wording

Addresses the June-06 PR #257 review.

1. High — Generated Cloudflare projects did not compile. The
   scaffold's `lib.rs.hbs` called `run_app::<App>(include_str!(...),
   req, env, ctx)` (4 args), but the current runtime API is
   `run_app(req, env, ctx)` (3 args). Verified by
   `cargo test -p edgezero-cli --test generated_project_builds --
   --ignored`, which failed pre-fix with E0061 "this function takes
   3 arguments but 4 arguments were supplied" and passes after.

   Fix: drop the obsolete `include_str!` argument; the template now
   matches `examples/app-demo/crates/app-demo-adapter-cloudflare`
   (which has been on the 3-arg form for a while).

2. Medium — Fermyon Cloud `--dry-run` returned before calling the
   real argv validation (key contains `=`, per-pair/per-chunk argv
   cap). A "successful" dry-run could be followed by a hard failure
   on the real push.

   Fix: call `push_cloud::chunk_entries(entries)?` inside the
   dry-run arm. Same validation as the real write_batch path, so a
   green dry-run is a real predictor of push success. Also surfaces
   the chunk count in the preview line ("for N entries across M
   invocation(s)") so operators can see the batching decision the
   real push would make.

   Regression covered by
   `dispatch_push_fermyon_cloud_dry_run_rejects_equals_in_key`.

3. Low — Stale Spin-config wording in places where the runtime
   moved from Spin variables to KV (which stores dotted keys
   verbatim):
   - `crates/edgezero-core/src/config_store.rs:212`: trait doc
     listed `SpinConfigStore` as "Spin component variables" —
     updated to "Spin KV (`spin_sdk::key_value::Store`)".
   - `examples/app-demo/app-demo.toml:24-28`: comment claimed
     `feature.new_checkout` was translated to
     `feature__new_checkout` on Spin's flat namespace — Spin now
     reads `feature.new_checkout` verbatim, no translation.
   - `examples/app-demo/crates/app-demo-core/src/config.rs:27-33`:
     same fix, on the typed AppConfig field's doc comment.

   These were doc drift only — runtime code already does the right
   thing, but the stale wording would mislead anyone seeding stores
   manually or migrating an older app.

Verified (all gates green):
- cargo fmt --all -- --check
- cargo clippy --workspace --all-targets --all-features -- -D warnings
- cargo test --workspace --all-targets
- cargo test -p edgezero-cli --test generated_project_builds -- --ignored
- cargo clippy -p edgezero-adapter-spin --target wasm32-wasip2 --features spin --all-targets -- -D warnings
- cargo clippy -p edgezero-adapter-fastly --target wasm32-wasip1 --features fastly --all-targets -- -D warnings
- cargo clippy -p edgezero-adapter-cloudflare --target wasm32-unknown-unknown --features cloudflare --all-targets -- -D warnings
- cd examples/app-demo && cargo test --workspace --all-targets
Addresses the post-f1179df PR #257 review.

1. Medium — Spin Cloud pushes are non-atomic across chunks (one
   `spin cloud key-value set` shellout per ≤96 KiB argv chunk), but
   the pre-fix error only named the failing chunk's size + exit
   status. If chunk 1 committed and chunk 2 failed, the operator
   was left with partially-updated live cloud state and no resume
   boundary. Fastly already produces a committed / failed /
   not-attempted diagnostic (cli.rs::push_entries_with_committer).

   Mirror Fastly's shape in `push_cloud::write_batch`: track a
   cursor through `entries` as committed-chunks accumulate, and on
   failure emit a structured error naming
   - committed keys (already on Fermyon Cloud, safe to skip),
   - failed-chunk keys (the cloud API is atomic per shellout, so a
     non-zero exit means none of these landed),
   - not-attempted keys (subsequent chunks, fully re-push needed),
   - a resume hint pointing out that `set` is idempotent so
     re-running with the full set is also safe.

   Regression covered by
   `write_batch_partial_failure_reports_committed_failed_and_not_attempted_keys`,
   which stands up a fake `spin` that succeeds on invocation 1 and
   fails on invocation 2, feeds 7 × ~30 KiB entries (>=3 chunks),
   and asserts the diagnostic names all three buckets plus the
   upstream stderr.

2. Medium — `docs/guide/manifest-store-migration.md`'s capability
   table still listed spin's Config as `Single (flat variables)`,
   but the Spin runtime is KV-backed and Multi for Config (one
   `spin_sdk::key_value::Store` per declared `[stores.config].id`).
   This page is linked from the loader's hard-error message when
   it encounters a pre-rewrite manifest, so the stale entry can
   actively mislead migrations. Changed to `Multi (KV label)`.

3. Low — Axum config-push docs claimed it was "future Stage 7
   work" and told users to populate `.edgezero/local-config-<id>.json`
   directly. `config push --adapter axum` ships and writes the same
   file the runtime reads. Updated:
   - `docs/guide/configuration.md` — bullet now points operators
     at `edgezero config push --adapter axum`.
   - `docs/guide/adapters/axum.md` — same bullet under the Config
     Store section; also calls out the typed flow from a
     downstream `<your-cli>` for `#[secret]` stripping.

Verified (all gates green):
- cargo fmt --all -- --check
- cargo clippy --workspace --all-targets --all-features -- -D warnings
- cargo test --workspace --all-targets
- cargo clippy -p edgezero-adapter-spin --target wasm32-wasip2 --features spin --all-targets -- -D warnings
- cd examples/app-demo && cargo test --workspace --all-targets
- (cd docs && npx prettier --check guide/manifest-store-migration.md guide/configuration.md guide/adapters/axum.md)
The June-07 review caught a clippy regression in the freshly-added
`write_batch` partial-failure diagnostic: under
`cargo clippy --workspace --all-targets --all-features -- -D warnings`
the direct slice indexing (`entries[..cursor]`, `entries[cursor..chunk_end]`,
`entries[chunk_end..]`) tripped `clippy::indexing_slicing`, and the
single-letter destructured binding `(k, _)` tripped
`clippy::min_ident_chars`. Both are part of this repo's strict-clippy
restriction set (Stage 8 chore/strict-clippy merge), so the previous
form failed CI on `cargo clippy` even though `cargo test` and
`cargo fmt` were clean.

Refactor: replace the three slice indices with `.get(..)` calls that
fall through to `&[]` if the in-bounds invariant is ever violated
(it can't be — `cursor` and `chunk_end` are produced from
`entries.len()` and `chunk_entries`'s structure) — and rename the
destructured binding to `(key, _value)`. Pure refactor: the
partial-failure error string and the
`write_batch_partial_failure_reports_committed_failed_and_not_attempted_keys`
regression test are unchanged. All 16 push_cloud tests still pass.

Verified (clean):
- cargo fmt --all -- --check
- cargo clippy --workspace --all-targets --all-features -- -D warnings
- cargo test -p edgezero-adapter-spin --features cli push_cloud
The June-07 review caught `npx prettier --check .` failing on
`docs/guide/cli-walkthrough.md` lines 190 / 202-204. Prettier doesn't
preserve indentation on continuation lines inside backtick-wrapped
inline-code spans (`KEY=VALUE`, `SET <key> <value>`, `azure_cosmos`),
so the de-indent it wants is purely a source-format change — the
rendered VitePress output is unchanged because the surrounding
backticks group the whole multi-line span as one inline code block.

Pure formatting; no content edits.

Verified: `(cd docs && npx prettier --check .)` is clean.
Integrate revision-isolated build caching and compatible dependency updates. Preserve audited SDK and codec pins, per-crate Syn major versions, and qualified WASI dependencies. Correct lifecycle fixture formatting required by CI.

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Implement portable outbound HTTP and request lifecycle contracts

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