cmd-fix-pr-chechers

Determine the current PR number and failing action name. Create a git worktree at .trees/pr-<number>-<action> for the PR branch (e.g. .trees/pr-42-build).

Inspect failing GitHub Actions logs using gh run list and gh run view --log-failed.

For each failure:

1. Analyze error context and stack traces
2. Fix the underlying issue in the worktree
3. Commit with message referencing the failure
4. Push to remote branch
5. Poll status with gh run watch (timeout 5 minutes)

If actions still fail, retrieve new logs and repeat (max 5 iterations total).

After 5 failed attempts, summarize remaining issues and exit.

Clean up the worktree on exit.

Run autonomously without approval checkpoints.