feat(router): make KNN a first-class classifier with a persisted, curated corpus#10652

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richiejp:feat/knn-first-class-router

Commits on Jul 16, 2026

feat(router): make KNN a first-class classifier with a persisted, curated corpus
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feat(router): name consulted corpus neighbours in knn decisions
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refactor(router): deduplicate knn plumbing and cut corpus hot-path waste
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feat(router): bind knn corpus vectors to an embedder fingerprint and fail closed on mismatch

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chore(mcp): align corpus tool prompts and the mutating-tool safety list

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feat(proto,backend): report embedding shape from the llama-cpp backend

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feat(embeddings): Go-side pooling — mean/last/decayed_mean with half-life

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feat(embeddings): accept chat messages[] and per-request pooling on /v1/embeddings

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chore(middleware): name the failing fields when post-merge validation 400s

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fix(embeddings): scheme override must not inherit the config's half-life

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