The agent's /upload and /checkout_git were synchronous, blocking until a
build finished, so the controller could not relay live per-step progress.
Add ?async=1 support: the agent saves/clones the source, starts the build in
a background thread (holding build_lock), and returns 202 + {"id": ...}
immediately. The controller dispatches async, then polls /progress/<job_id>,
appending each step/log line to the job log and SSE stream, and treats the
build as done when progress clears (404) and the worker reports ready.
- Add ctrl/ package: Flask app (waitress), SQLite job store, background
scheduler that probes configured workers, dispatches via /upload and
/checkout_git, fetches artifacts, and serves a single-page UI
- Supporting API: /api/jobs (create/list/detail/cancel), /api/workers,
/api/capabilities, artifact download, and SSE log stream
- Workers keep the existing HTTP API; add /progress/<job_id> endpoint and
per-step build tracking for live status
- Retire agent_manager.py and the cross-py-builder CLI; controller UI is
the primary frontend
- Record design in DESIGN.md; add waitress dependency
Note: /progress is exposed on the worker but the synchronous /upload and
/checkout endpoints block until a build completes, so per-step worker
progress is not yet relayed live in the UI. Live streaming needs an
async-start worker endpoint as a follow-up.
Brett Williams