v5.50.0 - the knowledge layer stops guessing

v5.50.0 — the knowledge layer stops guessing

Wave 4 (H22 retrieval repair): one session from recon report to shipped wave —
5 Opus 4.8 legs in worktrees, adversarial crucible, merge train, 80/80 integration green.

What's in it

• Retrieval repair (knowledge.py +459): scout now sees the node corpus
  (previously zero rows reached it); node index keyed (context, type) with a
  disambiguation list for ambiguous bare types; a type-name intent test replaces
  the old 2-token bail-out, so sentence-shaped questions route to the node path
  or an honest not-found instead of stale H21 prose — 0/25 confident-wrong
  on fresh adversarial probes; datasheets return all internal parm names +
  channels (12-label cap removed); similarity floor on the dense path; corpus
  build-stamp verified loudly at load.
• Tool schema: knowledge_lookup gains optional context and k — additive,
  back-compat held (171/161 census controls).
• Freshness release gate + ingest ledger (checks.py, ingest_ledger.py):
  served-corpus build stamp must match the ratified build, release-blocking;
  the per-context ingest ledger is single-writer by design.
• helpdoc parameterized: callers choose the help-archive build (.368/.400),
  loud SystemExit on a missing archive; no ingest path hardcodes a build.
• Gate P fork packet (harness/notes/h22/crux-ruling.md): the bookish-AST
  source ruling adversarially re-executed — regen reproduced to the integer
  (5,481 pages / 0 errors), one number corrected, four claims sharpened, and a
  staged-adoption advisory for the parser fork.
• Harness hardening (CRX0): _template.md now mandates commit-before-receipt
  after a systemic receipt-sentinel race was caught, recorded, and repaired.

Honest state — read before relying

• Freshness gate is RED on purpose: shipped corpus is .368, ratified build
  is .400. It stays red until the ING-DELTA re-ingest. That is the gate working.
• P@1 0.755 vs the 0.98 campaign bar on the hybrid scout — capped by node
  entries being absent from the dense semantic index (out-of-scope surface);
  the proven fix is held as spawn S1 for wave 5.
• suite_baseline is RED on master (R31 flat-baseline) — pre-existing,
  unrelated to this wave, queued for its own leg.

Receipts

Every claim above traces to harness/notes/receipts/W4-*.json; the crucible
verdict W4-CRUX.json is the wave's truth document — all builder numbers were
independently re-run, none inherited. Blueprint: harness/notes/h22/BLUEPRINT.md.