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Meta-layer over Phase 19 playbook_memory. Phase 19 answers "which WORKERS worked for this event"; KB answers "which CONFIG worked for this playbook signature" — model choice, budget hints, pathway notes, error corrections. tests/multi-agent/kb.ts: - computeSignature(): stable sha256 hash of the (kind, role, count, city, state) tuple sequence. Same scenario shape → same sig. - indexRun(): extracts sig, embeds spec digest via sidecar, appends outcome record, upserts signature to data/_kb/signatures.jsonl. - findNeighbors(): cosine-ranks the k most-similar signatures from prior runs for a target spec. - detectErrorCorrections(): scans outcomes for same-sig fail→succeed pairs, diffs the model set, logs to error_corrections.jsonl. - recommendFor(): feeds target digest + k-NN neighbors + recent corrections to the overview model, gets back a structured JSON recommendation (top_models, budget_hints, pathway_notes), appends to pathway_recommendations.jsonl. JSON-shape constrained so the executor can inherit it mechanically. - loadRecommendation(): at scenario start, pulls newest rec matching this sig (or nearest). scenario.ts: - Reads KB recommendation at startup (alongside prior lessons). - Injects pathway_notes into guidanceFor() executor context. - After retrospective, indexes the run + synthesizes next rec. Cold-start behavior: first run with no history writes a low-confidence "no prior data" rec so the signal that something was attempted is captured. Second run gets "low confidence, 0 neighbors" until a third distinct sig gives the embedder something to compare against — hence the upcoming scenario generator. VERIFIED: - data/_kb/ populated after one scenario run: 1 outcome (sig=4674…, 4/5 ok, 16 turns total), 1 signature, 2 recs (cold + post-run). - Recommendation JSON-parsed cleanly from gpt-oss:20b overview model. PRD Phase 22 added with file layout, cycle description, and the rationale for file-based MVP → Rust port progression that matches how Phase 21 primitives shipped. What's NOT here yet (batched follow-ups per J's request, tested between each): - Lift the k=10 hybrid_search cap to adaptive k=max(count*5, 20) - Scenario generator to bulk-populate KB with varied signatures - Rust re-weighting: push playbook_memory success signal INTO hybrid_search scoring, not just post-hoc boost