Jake Hillion 9357503c6f downloads: refactor to run at node level ...

The Worker previously owned the ShardDownloader directly via dependency
injection, which prevented --no-worker nodes from downloading and made
it impossible for multiple Workers to share a single downloader instance.

Moved download functionality to a new DownloadCoordinator component at
the Node level that communicates via the DOWNLOAD_COMMANDS pub/sub topic.
Workers now send StartDownload commands instead of calling the downloader
directly, and receive progress updates through the event-sourced state.

This decouples downloads from the Worker lifecycle and enables future
features like UI-triggered downloads to specific nodes and multi-worker
download sharing.

Test plan:
- Mostly tested in the next PR that adds explicit downloads/deletions to
  the dashboard.
- Started a model that isn't downloaded - it works.

2026-01-23 18:04:09 +00:00

..

headless_runner.py

downloads: refactor to run at node level

2026-01-23 18:04:09 +00:00

start_distributed_test.sh

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