Sam Valladares f97caff186 fix(core): V19 idempotency NULL/'' collision + VESTIGE_TRACE gate + trace retention ... - upsert_by_source lookup now matches the V19 unique index's NULL/'' bucketing (COALESCE on both sides); a legacy NULL-project row no longer collides with an empty-string envelope. Two regression tests added. - Black Box tracing gets an opt-out (VESTIGE_TRACE=0) parsed like the other levers, read once per process, plus a bounded retention sweep (VESTIGE_TRACE_RETENTION_DAYS, default 30, 0 keeps forever). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>		2026-07-25 21:58:03 +08:00
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vestige-core	fix(core): V19 idempotency NULL/'' collision + VESTIGE_TRACE gate + trace retention	2026-07-25 21:58:03 +08:00
vestige-mcp	fix(core): V19 idempotency NULL/'' collision + VESTIGE_TRACE gate + trace retention	2026-07-25 21:58:03 +08:00