Highlights

This patch release improves dispatcher stability for large project graphs and long-running worker executions.

Cairn now avoids OS argument-size failures by passing large graph snapshots through files inside the worker container, while keeping worker command argv small and preserving the existing dispatcher execution flow.

What's New

• Store large graph snapshots in worker containers via Docker archive copy instead of embedding full graph YAML in command arguments
• Keep completed/stopped container cleanup from being repeatedly enqueued once cleanup has already succeeded
• Preserve orphan project containers after server-side deletion so operators can inspect them manually
• Close Docker exec streams explicitly to avoid noisy urllib3 cleanup errors after timeout or cancellation
• Add clipboard copy fallback for the snapshot preview UI when the browser Clipboard API is unavailable
• Add ripgrep and fd to the worker container image for faster in-container file discovery
• Improve dispatch.yaml comments and document supported worker backends

Notes

• This release fixes the argument list too long failure seen when large graph YAML snapshots were passed through worker CLI argv
• Graph snapshot files are written under /tmp/cairn-prompts/<phase>-<uuid>/graph.yaml inside the project worker container
• Existing Claude Code, Codex, and Pi worker flows remain compatible
• Orphan containers are intentionally retained for manual debugging and inspection