distillation: Phase 5 — receipts harness (system-level observability)
Forensic-grade per-stage receipts wrapping all 5 implemented pipeline
stages. Pure additive observability — does NOT modify scoring,
filtering, or schemas (spec non-negotiable).
Files (6 new):
auditor/schemas/distillation/stage_receipt.ts StageReceipt v1
auditor/schemas/distillation/run_summary.ts RunSummary v1
auditor/schemas/distillation/drift_report.ts DriftReport v1, severity {ok|warn|alert}
scripts/distillation/receipts.ts runAllWithReceipts + buildDrift + CLI
tests/distillation/receipts.test.ts 18 tests (schema, hash, drift, aggregation)
reports/distillation/phase5-receipts-report.md acceptance report
Stages wrapped:
collect (build_evidence_index → data/evidence/)
score (score_runs → data/scored-runs/)
export-rag (exports/rag/playbooks.jsonl)
export-sft (exports/sft/instruction_response.jsonl)
export-preference (exports/preference/chosen_rejected.jsonl)
Reserved (not yet implemented): extract-playbooks, index.
Output tree (per run_id):
reports/distillation/<run_id>/
collect.json score.json export-rag.json export-sft.json export-preference.json
summary.json summary.md drift.json
Test metrics: 135 distillation tests pass · 0 fail · 353 expects · 1.5s
(Phase 5 added 18; total 117→135)
Real-data run-all (run_id=78072357-835d-...):
total_records_in: 5,277 (across 5 stages)
total_records_out: 4,319
datasets: rag=448 sft=353 preference=83
total_quarantined: 1,937 (score's partial+human + each export's quarantine)
overall_passed: false (collect skipped 2 outcomes.jsonl rows missing created_at —
carry-over from Phase 2; faithfully propagated)
run_hash: 7a14d8cdd6980048a075efe97043683a4f9aabb38ec1faa8982c9887593090e0
Drift detection (second run):
prior_run_id detected automatically
severity=ok (no count or category swung >20%)
flags: ["run_hash differs from prior run"] — expected, since recorded_at
is baked into provenance and changes per run. No false alert.
Contamination firewall — verified at receipt level:
export-sft validation.errors: [] (re-reads SFT output, fails loud if any
quality_score is rejected/needs_human_review)
export-preference validation.errors: [] (re-reads, fails loud if any
chosen_run_id == rejected_run_id or chosen text == rejected text)
Invariants enforced (proven by tests + real run):
- Every stage emits ONE receipt per run (5/5 on disk)
- All receipts share run_id (uuid generated per run-all)
- aggregateIoHash is order-independent + collision-free across path/content
- Schema validators gate every receipt before write (defense in depth)
- Drift detection: pct_change > 20% → warn; new error class → warn
- Failure propagation: any stage validation.passed=false → overall_passed=false
- Self-validation: harness throws if RunSummary/DriftReport fail their own schema
CLI:
bun run scripts/distillation/receipts.ts run-all
bun run scripts/distillation/receipts.ts read --run-id <id>
Spec acceptance gate (now.md Phase 5):
[x] every stage emits receipts
[x] summary files exist
[x] drift detection works (severity ok|warn|alert)
[x] hashes stable across identical runs
[x] tests pass (18 new + 117 cumulative = 135)
[x] real pipeline run produces full receipt tree (8 files)
[x] failures visible and explicit
Known gaps (carry-overs):
- deterministic_violation flag exists in DriftReport but not yet populated
(requires comparing input_hash AND output_hash across runs; current
implementation compares output only)
- recorded_at baked into provenance means identical source produces different
output_hash on different runs — workaround: --recorded-at pin for repro tests
- drift threshold hard-coded at 20%; should be env-overridable for noisy datasets
- stages still continue running even if upstream stage failed; exports use stale
scored-runs in that case. Acceptable because export validation_pass reflects
health, but future tightening could short-circuit.
Phase 6 (acceptance gate suite) unblocked.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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