feat(embedder): SQLite per-utterance embedding cache#340

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Commits on Jun 25, 2026

docs(spec): SQLite per-utterance embedding cache design

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docs(spec): revise SQLite cache design after adversarial review (3 rounds)

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docs(plan): SQLite embedding cache implementation plan

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docs(plan): fix static-gate defects found in plan review

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feat(cache): add get_cache_dir() + global embedding-cache test isolation

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feat(cache): add SQLiteEmbeddingCache per-utterance store

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refactor(embedder): lift embedding cache into a per-utterance template method

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test(cache): cover per-utterance reuse, dedup, order, and empty input

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docs(changelog): note SQLite embedding cache and AUTOINTENT_CACHE_DIR

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fix(embedder): handle HashingVectorizer empty input gracefully

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