lakehouse/reports/distillation/phase6-acceptance-report.md

Phase 6 — Acceptance Gate Report

Run: 2026-04-27T15:43:37.943Z Fixture: tests/fixtures/distillation/acceptance/ Temp root: /tmp/distillation_phase6_acceptance Pipeline run_ids: acceptance-run-1-stable (first) + acceptance-run-2-stable (second / hash reproducibility)

Result: PASS ✓

Pipeline counts (first run)

• collect: 14 records out · 1 skipped
• score: accepted=6 rejected=4 quarantined=4
• export-rag: 7 rows
• export-sft: 5 rows
• export-preference: 2 pairs

Invariant checks (expected vs actual)

#	Check	Expected	Actual	Status
1	receipts: all 5 stages emitted	collect,score,export-rag,export-sft,export-preference	all present	✓
2	summary.json exists	exists	exists	✓
3	summary.md exists	exists	exists	✓
4	drift.json exists	exists	exists	✓
5	every StageReceipt validates against schema	0 invalid	0 invalid	✓
6	RunSummary validates	valid	valid	✓
7	DriftReport validates	valid	valid	✓
8	SFT: ≥1 accepted record exported	>=1	5	✓
9	SFT contamination firewall: no rejected/needs_human_review	0	0	✓
10	SFT default mode: 0 partial leaks (no --include-partial used)	0	0	✓
11	RAG: 0 rejected leaks	0	0	✓
12	RAG: ≥1 partially_accepted accepted (RAG accepts partial)	>=1	2	✓
13	Preference: ≥1 valid pair exported	>=1	2	✓
14	Preference: 0 self-pairs (chosen_run_id != rejected_run_id)	0	0	✓
15	Preference: 0 identical-text pairs	0	0	✓
16	every export row has valid sha256 provenance.sig_hash	0 missing	0 missing	✓
17	Phase 2 collect: missing-provenance fixture row skipped to distillation_skips.jsonl	≥1 skip recorded	1 skip(s)	✓
18	SFT quarantine: rejected/needs_human caught at unsafe_sft_category gate	≥1	6	✓
19	scratchpad/tree-split case: fixture row materialized into evidence	found	found	✓
20	PRD drift case: fixture row materialized	found	found	✓
21	hash reproducibility: per-stage output_hash identical across runs	0 mismatches	all match	✓
22	hash reproducibility: run_hash identical	8dfdacee62380ec2...	8dfdacee62380ec2...	✓

Hash reproducibility detail

run 1 run_hash: 8dfdacee62380ec20b7420d8f8bad3c395822da6eb0b41eeecd356e88fe20bf0

run 2 run_hash: 8dfdacee62380ec20b7420d8f8bad3c395822da6eb0b41eeecd356e88fe20bf0

Bit-for-bit identical. Two runs of the entire pipeline on the same fixture with the same recorded_at produce the same outputs. Distillation is deterministic.

Leak prevention confirmation

• SFT rows with rejected/needs_human_review quality_score: 0 (must be 0)
• SFT rows with partially_accepted quality_score (default mode): 0 (must be 0; would only appear with --include-partial)
• RAG rows with rejected success_score: 0 (must be 0)
• Preference self-pairs (chosen_run_id == rejected_run_id): 0 (must be 0)
• Preference identical-text pairs: 0 (must be 0)

What this proves

The distillation pipeline is safe, reproducible, and gated. Accepted data flows through; rejected/needs_human_review data is quarantined with reasons; preference pairs are real, not fabricated; every output traces to source via canonical sha256; running the whole pipeline twice on the same fixture produces byte-identical outputs.