Support non-functional redundant properties

[dahlia]

FEP-6757 needs aliases for multi-valued licenses. The decoder checks the canonical property first and chooses the first non-empty raw value set before applying range and container decoding. Keeping sets separate avoids widening a license grant when aliases disagree.

redundantPropertiesWrite: canonical accepts aliases when reading and writes only the canonical property; the default all preserves existing output. URI-only and container aliases use the JSON-LD processor to preserve IRI types and complete containers. The shared schema validates these options for both property kinds.

Fixes #1210.

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📝 Walkthrough

Walkthrough

The change adds ordered redundant-property reads and configurable writes for functional and non-functional properties. The schema, JSON-LD codec, tests, and documentation cover alias selection, serialization policies, containers, and URI aliases.

Changes

Redundant property support

Layer / File(s)	Summary
Schema contract and validation packages/vocab-tools/src/schema.ts, packages/vocab-tools/src/schema.yaml, packages/vocab-tools/src/schema.test.ts	The schema accepts ordered redundantProperties and the all or canonical write policy for functional and non-functional properties. Tests cover supported settings and invalid schema data.
Codec behavior and usage packages/vocab-tools/src/codec.ts, packages/vocab-tools/src/codec.test.ts, packages/vocab-tools/package.json, packages/vocab-tools/README.md, .agents/skills/add-vocab/SKILL.md, CHANGES.md, changes.d/vocab-tools/redundant-properties.md	Reads select the first non-empty value set without merging aliases or retrying invalid values. Writes follow the configured policy. Tests and documentation cover container values, compact and expanded serialization, custom contexts, and URI aliases.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 4c747

The heading follows the project’s subsection style, and the unreleased changelog entry is represented by its source fragment. No actionable merge risk remains.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 4c747

Ordered property selection avoids combining conflicting license values, and canonical-only output is opt-in. Parsed objects still preserve their original document during default serialization. No introduced security defect was established, but compatibility with downstream consumers was not fully verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The compatibility surface includes generated classes whose schemas configure redundant properties, particularly newly supported multi-valued fields. The available evidence does not establish the external consumer, tenant, or service scope of those generated classes.

Trust Boundaries and Controls

• observed — Input JSON-LD can supply competing canonical and alias values, but the generated decoder chooses one raw property set before applying range decoding. It neither unions competing sets nor falls back to another alias because selected values are invalid. URI/container serialization retains the existing caller-context-loader boundary.

Resilience and Maintainability Implications

• observed — Default cache-preserving serialization and explicit policy-controlled serialization are deliberately separate contracts. The README documents that distinction, which matters when callers expect canonical-only output; the cache-return behavior predates this PR.

🚥 Pre-merge checks | ✅ 3 | ❌ 1 | ❓ 1

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.
Linked Issues check	❓ Inconclusive	The available summary supports the main [#1210] requirements: ordered, non-merging alias reads; all and canonical writes; schema support; container handling; and codec tests for aliases and contex…	Provide evidence that the Deno, Node.js, and Bun snapshots were checked or regenerated together, and that existing functional uses have no snapshot diff.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: support for non-functional redundant properties.
Description check	✅ Passed	The description explains the alias read and write behavior, schema validation, and the FEP-6757 use case. It is directly related to the changeset.
Out of Scope Changes check	✅ Passed	The listed codec, schema, test, documentation, changelog, and development-dependency changes support [#1210]. The available summary identifies no unrelated change.

Full details: Linked Issues check

Explanation

The available summary supports the main [#1210] requirements: ordered, non-merging alias reads; all and canonical writes; schema support; container handling; and codec tests for aliases and contexts. It does not establish whether the Deno, Node.js, and Bun snapshots were regenerated together or whether existing functional snapshots remain unchanged, as required by [#1210].

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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Review comments at @CHANGES.md:
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ℹ️ Review info

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📒 Files selected for processing (10)

• .agents/skills/add-vocab/SKILL.md
• CHANGES.md
• changes.d/vocab-tools/redundant-properties.md
• packages/vocab-tools/README.md
• packages/vocab-tools/package.json
• packages/vocab-tools/src/codec.test.ts
• packages/vocab-tools/src/codec.ts
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• packages/vocab-tools/src/schema.yaml

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

Files with missing lines	Coverage Δ
packages/vocab-tools/src/codec.ts	98.00% <100.00%> (+0.07%)	⬆️
packages/vocab-tools/src/schema.ts	90.74% <ø> (+16.66%)	⬆️

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