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Jiangzhou 5b6e3f5538 feat: make sentence-transformers optional; interactive ccc init (#132)
- Move `sentence-transformers` behind `[embeddings-local]` and `[default]`
  extras (via `cocoindex[sentence-transformers]`), so `pip install
  cocoindex-code` is LiteLLM-only. Closes #117.
- `ccc init` is now interactive when global settings don't exist: pick
  provider (sentence-transformers / litellm) and model via a
  questionary TUI. New `--litellm-model MODEL` flag skips prompts and
  is the non-TTY escape hatch for LiteLLM. Closes #70.
- Change the default sentence-transformers model from
  `all-MiniLM-L6-v2` to `Snowflake/snowflake-arctic-embed-xs`
  (lighter, better quality for code).
- Generated `global_settings.yml` now includes a `ccc doctor` reminder
  and commented-out env-var examples (OPENAI_API_KEY, GEMINI_API_KEY,
  ANTHROPIC_API_KEY, VOYAGE_API_KEY).
- Model test during init runs in the daemon via the existing
  `DoctorRequest` path; the daemon loads the model once and stays
  running, so the user's next `ccc index` starts warm.
- Docker image now installs `cocoindex-code[default]` and pre-caches
  the new default model. The `COCOINDEX_CODE_EMBEDDING_MODEL` env var
  is no longer documented for Docker; users mount a
  `global_settings.yml` or pass `--litellm-model`.
- Extract `check_embedding` + `EmbeddingCheckResult` into `shared.py`;
  refactor daemon `_check_model` to delegate. Error messages in doctor
  output now include the exception type name (strictly more
  informative).
- Tests switch to a lighter `paraphrase-MiniLM-L3-v2` model via a new
  `make_test_user_settings()` helper in `conftest.py`, leaving CI
  cache costs unchanged.
2026-04-13 22:25:17 -07:00
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