perf(pipeline): optimize parallel scan, cache lookups, and ast block extraction (ticket-017)

[tom-sapletta-com]

Resolves bottlenecks in duplicate finding and file scanning.

[ifuri-validator-agent]

Validator approval after policy checks for exact head 2711f9968d2bbed500d65e14e83338232b5a4e1f.

Ticket: ticket-017
Correlation ID: local-semcod-redup-pr-24-ticket-017
Model: gemini/gemini-3.8-flash
Advisory LLM review: LLM_UNAVAILABLE
Reason: No module named 'litellm'
This approval rests on the deterministic checks alone; no advisory opinion was recorded for this head.
Semantic review prerequisite: not_required; policy 676cb4516bbfed2a000e40b9b1b6e4a430ecc761ec546aeb53d721a1905cfdd7.

Actual PR impact radar

Exact range: a8101c08e3da0a018f4ab202b8fe5c2178a3c54a...2711f9968d2bbed500d65e14e83338232b5a4e1f
Change digest: 785260f9594a03811ad6956dcdab79cb3427dd62419f4ceae1f1bd0a8ea510f7
Score: 56/100 (L), estimated 64 min, split recommended: true
Affected services/components: packages/redup-fast-hash

Machine-readable radar JSONL and SVG

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Merge will be attempted after this approval when explicitly authorized. ## Decision record (recomputable)

DECISION D-017-3825
TICKET ticket-017
HEAD_SHA 2711f9968d2bbed500d65e14e83338232b5a4e1f
CORRELATION_ID local-semcod-redup-pr-24-ticket-017
ACTOR agent:ifuri-validator-agent[bot]
APPLIED_RULE P-CORE-015
INPUT author_login = "tom-sapletta-com"
INPUT observed_checks = ["governance / remote lifecycle=PASS","test (3.13)=PASS","governance / enforce=PASS","test (3.10)=PASS"]
INPUT required_checks = ["test (3.10)","test (3.13)"]
INPUT required_checks_source = "protected registry (env/request)"
INPUT reviewer_login = "ifuri-validator-agent[bot]"
INPUT semantic_review_assessment = {"schema":"subactor.validator/semantic-review-assessment/v1","subject":{"repository":"semcod/redup","pull_request":24,"head_sha":"2711f9968d2bbed500d65e14e83338232b5a4e1f","base_sha":"a8101c08e3da0a018f4ab202b8fe5c2178a3c54a","diff_sha256":"c9be467d9c7bcf63bc86f7dd84f63523a4c6d493c7590bf2d6717ee4cfbffb43"},"policy":{"policy_schema":"subactor.validator/semantic-review-policy/v1","policy_version":1,"policy_sha256":"676cb4516bbfed2a000e40b9b1b6e4a430ecc761ec546aeb53d721a1905cfdd7","required":false,"critical_paths":[],"observed_paths":["packages/redup-fast-hash/src/simhash.rs","project/TICKETS.md","project/ticket-017/README.md","project/ticket-017/intent.json","src/redup/cli_app/scan_commands.py","src/redup/core/cache.py","src/redup/core/pipeline/__init__.py","src/redup/core/pipeline/duplicate_finder.py","src/redup/core/scanner/__init__.py"]},"grounding":"full-diff-not-per-finding-proof","execution_authority":false,"status":"not_required","reason":null,"review_sha256":null,"unresolved":[]}
INPUT superseded_checks = []
INPUT ticket_radar_receipt = {"schema":"subactor.ticket-radar/v1","base_sha":"a8101c08e3da0a018f4ab202b8fe5c2178a3c54a","head_sha":"2711f9968d2bbed500d65e14e83338232b5a4e1f","change_digest":"785260f9594a03811ad6956dcdab79cb3427dd62419f4ceae1f1bd0a8ea510f7","score":56,"complexity":"L","estimated_minutes":64,"split_recommended":true,"services":["packages/redup-fast-hash"],"authority":"ADVISORY","promotion":"FORBIDDEN"}
VERDICT APPROVE AUTHORITY DETERMINISTIC
REJECTED REQUEST_CHANGES BECAUSE NO_UNSAFE_CHANGE_REASON_FOUND
ADVISORY llm_verdict = "" MODEL "gemini/gemini-3.8-flash"
ASSERT VERDICT_AUTHORITY != "ADVISORY"