Implement #100 Phase 0 contract proof and flag-gated Phase 1 evidence preview - #1909
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… preview Incremental verified delivery per docs/verified-answer-incremental-delivery-design.md: - answer-stream-contract: VerifiedUnit types and isDeliverableVerifiedUnit (schema version, kind allowlist, strictly-increasing sequence, bounded JSON size); the token/revising SSE event names remain excluded. - answer-preview: buildEvidencePreviewUnit reuses the production danger-level source-governance refusal and the exact route-boundary source trim; any danger warning suppresses the preview entirely (stricter than the final response, whose refusal only fires on grounded supported answers). - answer-progress-public: optional verifiedUnit passthrough, dropped (never repaired) when validation fails; old clients ignore the field. - rag.ts: the retrieved progress event carries the preview only when RAG_INCREMENTAL_EVIDENCE_PREVIEW=true (new env flag, default false in env.ts and .env.example). No new SSE event name; Phase 2 per-section generation is not attempted (provider-gated by design). - tests/answer-incremental-delivery.test.ts: Phase 0 offline contract proof — schema/sequence validation, token/revising rejection, governance refusal emitting zero units, owner-boundary trimming, byte-identical preview/final reconciliation at the trim layer, flag-off default. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WBdo125Dh3idPcF7CmCCmG
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✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WBdo125Dh3idPcF7CmCCmG
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Testing
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Actionable comments posted: 3
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Inline comments:
In @.env.example:
- Line 154: Reorder the RAG environment keys in the configuration example so
RAG_INCREMENTAL_EVIDENCE_PREVIEW appears before RAG_SEMANTIC_RERANK_ENABLED,
preserving their existing values.
In `@src/lib/answer-stream-contract.ts`:
- Around line 44-50: The verified-unit validation in the answer-stream contract
must validate payload contents, not just container types, before
toPublicAnswerProgressEvent emits them. Add strict schemas or allowlists for
client-safe sources, AnswerSection (including its required body field),
citations, and supportLevel; reject server-only SearchResult fields, empty or
oversized previews, and selectedContextCount values that are non-finite or
non-integer. Add regression coverage for raw server fields and malformed section
payloads.
In `@tests/answer-stream-preview-order.test.ts`:
- Around line 89-94: Update the ordering assertions in the SSE test to parse
individual frames and locate the ranking frame’s payload, then assert it
contains verifiedUnit.kind equal to evidence_preview before comparing ranking,
generating, and final order. Keep the existing ordering expectations while
ensuring the test verifies actual preview delivery rather than only the ranking
stage label.
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📒 Files selected for processing (13)
.env.exampledocs/branch-review-records/6a5bd9d5cba90563645f1d0ccdbae85ce69990ed735f5494573242f14c7abdc9.record.mddocs/outstanding-issues-inbox/75df9b82-7ecc-4aa2-bdac-653da976fe53.jsondocs/outstanding-issues-inbox/e1506952-64c6-472f-9da4-812f8d69b483.jsonsrc/app/api/answer/stream/route.tssrc/lib/answer-client-payload.tssrc/lib/answer-preview.tssrc/lib/answer-progress-public.tssrc/lib/answer-stream-contract.tssrc/lib/env.tssrc/lib/rag/rag.tstests/answer-incremental-delivery.test.tstests/answer-stream-preview-order.test.ts
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Summary
docs/verified-answer-incremental-delivery-design.md, ledger#100), improving time-to-first-useful-content without reviving token streaming.src/lib/answer-stream-contract.ts,tests/answer-incremental-delivery.test.ts):VerifiedUnittypes plusisDeliverableVerifiedUnitvalidation — schema version, kind allowlist, strictly-increasing per-response sequence, bounded JSON size — with tests proving rejection oftoken/revisingshapes, zero units under a danger-level governance refusal, owner-boundary trimming (no server-only source fields cross the route), and byte-identical preview/final reconciliation at the trim layer. No new SSE event name is introduced.src/lib/answer-preview.ts,src/lib/answer-progress-public.ts,src/lib/rag/rag.ts,src/lib/env.ts,.env.example):buildEvidencePreviewUnitreuses the production danger-level source-governance decision and the exacttrimSourceForClientroute-boundary trim (src/lib/answer-client-payload.ts, export added) — deliberately stricter than the final response's refusal, since the answer's support level is unknown at preview time. Theretrievedprogress event carries the unit only whenRAG_INCREMENTAL_EVIDENCE_PREVIEW=true(default false); the public DTO passes it through only when it validates, dropping malformed units rather than repairing them.RAG impact: no retrieval behaviour change — retrieval, ranking, selection, generation, and the final answer payload are untouched; the only pipeline edit attaches an optional, governed, flag-gated (default off) preview field to an existing progress event.
Verification
npm run verify:pr-local— completed all checks withfailed: (none): runtime, lock parity, format, lint, typecheck, full unit suite, build,eval:rag:offline, medication gates.node scripts/run-vitest.mjs run tests/answer-incremental-delivery.test.ts— 13/13 passed (Phase 0 contract proof).npm run check:production-readiness— run; fails only on the documented demo-mode provider capability gap (no Supabase/OpenAI secrets in this environment), which the readiness check itself classifies as missing env, not a code regression. No governance/privacy check regressed.npm run verify:ui— UI verification not run: no client rendering was added; no UI, routing, or styling behaviour changed.npm run verify:release— not run; no release-confidence claim is made.npm run eval:retrieval:quality— not run: retrieval, ranking, selection, chunking, and scoring are unchanged;eval:rag:offlinepassed viaverify:pr-local.npm run eval:rag -- --limit 15/npm run eval:quality -- --rag-only— not run: answer generation and post-processing are unchanged; the design's provider-backed gates apply to Phase 2 and to enabling emission in production, both of which are out of scope here.npm run check:deployment-readiness— not run; no deployment behaviour changed.Risk and rollout
RAG_INCREMENTAL_EVIDENCE_PREVIEW(or revert the branch commit); no schema, stored-data, or client rollback is needed.Clinical Governance Preflight
Clinical KB Database(sjrfecxgysukkwxsowpy)adjacent_context,memory_cards,table_facts,document_summary, and full image objects cannot cross the stream boundaryNotes
token/revisingstill rejected at the event-name allowlist).verifiedUnit, render the "Selected evidence — answer still being verified" region behind its own rendering flag, thenverify:ui.🤖 Generated with Claude Code
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Summary by CodeRabbit
New Features
Bug Fixes
Tests