`text-embedding-ada-002` is deprecated. `openai.rs` should switch to `text-embedding-3-small` which has the same 1536d output dimension, the same API shape, and lower cost per token.
Changes:
- Update the model name string in `openai.rs`
- Make the model name configurable via env var (e.g. `OPENAI_EMBEDDING_MODEL`) so it can be changed without a rebuild
- Verify the response shape is identical (it is — same `data[].embedding` field)
`text-embedding-ada-002` is deprecated. `openai.rs` should switch to `text-embedding-3-small` which has the same 1536d output dimension, the same API shape, and lower cost per token.
Changes: