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v3.6.6

feat: v3.6.6 recall precision & memory hygiene
@varun369 varun369 tagged this 10 Jun 02:10 
Read path:
- Evidence floor: results must earn channel evidence (semantic >=0.60 or
  bm25/entity/temporal signal or pinned); associative-only channels no longer
  fabricate matches. Empty result + no_confident_match instead of filler.
- Recall output budget: per-fact clamp (head+tail) + total budget with stubs;
  optional full=true bypass. Source_content preview + prompt-template firewall.
- Applied at the single shared chokepoint (RetrievalEngine.recall + shared
  serializer) so MCP, CLI, daemon HTTP, in-process adapter, and WorkerPool
  return identical output across surfaces and modes A/B.

Write path:
- Ingest gate: clamp facts >24K chars (head+tail; full original kept in source
  memory), reject >1MB, prompt-template firewall. Core-block hygiene: within-
  block line dedup + low-quality filter + char cap + daily recompile.

Backward compatible: additive params/fields only, no schema migrations, env
kill-switches (SLM_RECALL_NO_FLOOR, SLM_INGEST_NO_GATE). 86 new tests; targeted
+ integration suites green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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