Three bundled changes that round out the KB enrichment pipeline
(PR #9 commits B/C/D compressed into one — they all touch the same
persist surfaces so splitting them would just add noise):
B. scrum_master reviews now route accepted review bodies through
fact_extractor (same llm_team extract pipeline as inference) and
append to data/_kb/audit_facts.jsonl tagged source:"scrum_review".
One KB, two producers — downstream consumers can filter by source
when they care about provenance. Skips reviews <120 chars
(one-liners / LGTM-type comments with no extractable knowledge).
C. Verifier-gated fact persistence. fact_extractor now parses the
verifier's free-form prose into per-fact verdicts (CORRECT /
INCORRECT / UNVERIFIABLE / UNCHECKED). Facts marked INCORRECT are
dropped on write; CORRECT + UNVERIFIABLE + UNCHECKED are kept
(dropping UNVERIFIABLE would lose ~90% of real signal — the
verifier's prior-knowledge base doesn't know Lakehouse internals,
so domain-specific facts read as UNVERIFIABLE by default).
verifier_verdicts array is persisted alongside facts so downstream
queries can surface high-confidence facts (CORRECT) separately
from provisional ones (UNVERIFIABLE).
schema_version:2 added to both scrum_reviews.jsonl and
audit_facts.jsonl writes. Old (v1) rows remain readable; new rows
get the field so the forward-compat reader in kb_query can
differentiate.
D. scrum_master_reviewed:true flag added to scrum_reviews.jsonl
rows on accept. Future kb_query surfacing can filter by this
(e.g., "show me PRs where a scrum review exists vs only inference"
as governance signal). Also carried into audit_facts.jsonl when
the scrum_review source path writes there.
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