## Summary
- Add `Dockerfile.test`: Python 3.12 image with Claude Code CLI
installed
- Add `scripts/test-docker.sh`: Local script to run tests in Docker
- Add `test-e2e-docker` job to CI workflow that runs the full e2e suite
in a container
- Add `.dockerignore` to speed up Docker builds
## Context
This helps catch Docker-specific issues like #406 where filesystem-based
agents loaded via `setting_sources=["project"]` may silently fail in
Docker environments.
## Local Usage
```bash
# Run unit tests in Docker (no API key needed)
./scripts/test-docker.sh unit
# Run e2e tests in Docker
ANTHROPIC_API_KEY=sk-... ./scripts/test-docker.sh e2e
# Run all tests
ANTHROPIC_API_KEY=sk-... ./scripts/test-docker.sh all
```
## Test plan
- [x] Unit tests pass in Docker locally (129 passed)
- [ ] CI job runs successfully
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude <noreply@anthropic.com>
