feat(semantic): [merge candidate build] FTS5 index and search tools, provider-aware typed embeddings, reranking, diagnostics, and eval harness

.fastembed_cache/models--Qdrant--all-MiniLM-L6-v2-onnx/blobs/56c8c186de9040d4fea8daac2ca110f9d412bf04

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+}

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+}

.fastembed_cache/models--Qdrant--all-MiniLM-L6-v2-onnx/blobs/9bbecc17cabbcbd3112c14d6982b51403b264bfa

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+}