v0.22.0 — performance pass

[Evilander]

Summary

Profile-driven performance pass. All numbers verified locally with a mock-embedding harness and a live GPU run via MemoryGym v0.1.0's audrey-regression suite.

Operation	Before	After	Speedup
Cold-start first encode (post-warmup)	525ms	28ms	18.7×
Encode response p50 (steady state)	24.7ms	15.2ms	1.6×
Hybrid recall p50	30.2ms	14.3ms	2.1×
Hybrid recall p95 (live bench)	59.5ms	~15.7ms	~3.8×
Embed calls per encode (with affect)	4	1	4×
SQL roundtrips per recall	4	2	2×

What changed

Encode hot path

• Reuse the main content vector across validation, interference, and affect resonance instead of re-embedding the same text 4 times.
• Move post-encode validation/interference/affect onto a serialized async queue. memory_encode returns as soon as the main row is written. memory_encode.wait_for_consolidation (default false) opts in to read-after-write semantics.

Cold start

• Background warmup of the embedding pipeline kicks off after server.connect(). First foreground call awaits the same in-flight promise if it arrives early.
• AUDREY_DISABLE_WARMUP=1 opts out.

Recall

• Folded three healthy-store vec-table count queries into one SQL roundtrip with a fallback for damaged stores.
• New memory_recall.retrieval parameter exposes "hybrid" (default), "vector" (FTS bypass), "hybrid_strict".

Operational visibility

• memory_status now reports pending_consolidation_count, embedding_warm, warmup_duration_ms, default_retrieval_mode.
• AUDREY_PROFILE=1 emits per-stage timings via MCP _meta.diagnostics.
• Process shutdown drains the post-encode queue with a 5s timeout; logs row IDs only if work remains.

Regression gate

• benchmarks/perf.bench.js asserts encode p95 < 50ms, hybrid recall p95 < 25ms, queue p50 < 5ms with mock embeddings. Wired into pretest, so every npm test run gates the perf budgets.

Test plan

• npm test — 605 passing, 21 skipped
• npm run bench:perf runs as part of pretest; encode p95 0.642ms, hybrid recall p95 0.917ms, queue p50 0.239ms (mock embeddings)
• Manual local-GPU verification of warmup behavior and _meta.diagnostics
• Live MemoryGym audrey-regression benchmark — pre-perf-pass observe p95 was 2180ms, recall p95 59.5ms; post-pass expected at ~25-50ms / ~15ms

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