Closes#114, #115, #116, #117.
- Deterministic, offline, dependency-free char-ngram embedding backend + config
section (semantic.enabled default false, min_similarity, backend).
- Committed embedding index (data/kb_embedding_index.json) mapping vectors to real
KB entry ids only; built by scripts/build_embedding_index.py, loaded once/cached.
- Resolver falls back to the nearest entry on a deterministic miss when enabled,
accepting >= min_similarity and emitting SC0020; NSFW-gated neighbours are
skipped. Disabled => byte-identical to before.
- Guarantee tests: deterministic lookup always wins (exact hit never queries the
index), fallback emits only KB tags (no invention), identical input => identical
output. SC0020 registered.
Co-authored-by: kunail0804 <kunail0804@gmail.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
