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chimera find

Search a repository by what code DOES, not by the string it contains. `chimera/rag/` has been in the tree since 0.44.0 — symbol-level chunking over Python's AST, one SQLite file with an FTS5 index, RRF fusion — measured, documented, and reachable from nothing. A library with no entrance is a library nobody has. This is the entrance. Keyword by default; `--semantic` fuses it with embeddings, and the fusion is what was measured and adopted in `bench/rag/RESULTS.md`: hybrid 0.5050 against keyword 0.4425 on this repository, +6.25 pp paired over 400 probes, McNemar p = 1.7e-04. **`--semantic` means HYBRID, never vectors alone**, and that is the measurement rather than a preference: the vector arm on its own scored **0.4100 — worse than keyword**. Every point of the win comes from fusing two rankings that are wrong about different things. A flag that gave you the vector arm would be a flag that made your search worse. The recall figure is printed with every search because it is per-corpus and per-embedder: the same harness measures 0.4750 on this repository as it stood three weeks ago, and there is no conversion from one embedding model's vector space to another's.