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ADR-019: closed the "re-bench when 10M corpus exists" follow-up. Added "Follow-up: 10M re-bench (2026-05-02)" section with the post-fix numbers (search ~20ms warm / ~46ms cold, doc-fetch ~5ms post-btree). Documented the lance-bench-bypassing-IndexMeta bug + 2-layer fix + gauntlet (7 unit + 12 sanitize + 10 smoke probes). Reframes the strategic question as "Lance vs Parquet+HNSW-with-spilling" since HNSW doesn't fit RAM at 10M. DECISIONS: added ADR-022 — drop Python sidecar from Rust hot path. Captures the rationale (236× embed perf gap was pure overhead), co-shipped LRU cache, dev-only Python that survives, cross-runtime parity verification, and the operator runbook signal (ps -ef ABSENT post-deploy). PRD: updated AI Boundary table line + aibridge crate description to reflect direct Ollama path (was: Python FastAPI sidecar → Ollama). Both lines reference ADR-022 for the full rationale. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>