<!-- Keep PRs focused: one logical change per PR. Branch off `main`. -->

## Summary

<!-- 1-3 sentences. What does this PR do and why. -->

## Changes

<!-- Bullet list of the key changes. File paths welcome. -->
- 

## Test plan

<!-- How did you verify it works? Tick what applies. -->
- [ ] `pytest -q` passes locally
- [ ] Streamlit demo still loads (`make demo`)
- [ ] FastAPI service starts and `/health` returns `pipeline_loaded: true`
- [ ] Docker image builds (`docker build -t guichetoi-ml .`)
- [ ] No new files contain customer PII

## Risk

<!-- Anything reviewers should look at extra carefully? -->
-