Add BAML Support

[kordless]

https://github.com/BoundaryML/baml

[kordless]

We’ve landed the base prerequisites for BAML (Dockerfile installs @boundaryml/baml and sets up /opt/baml-workspace, see Dockerfile:70-100 and scripts/codex_entry.sh:207-213), but there’s still no MCP server or CLI wrapper to actually run BAML flows. Next steps to fully close this issue:

1. Implement the BAML MCP server sketched in vibe/BAML-INTEGRATION.md (expose a tool for creating/running BAML projects and returning structured output).
2. Add instructions + example workflows in README so users can try BAML commands from Codex.
3. Optional: ship a starter BAML project (e.g., contact info extractor) inside /opt/baml-workspace to validate the pipeline.

Once those pieces land we can call “Add BAML Support” complete.