Resolve PR Comments in Parallel (v3)

DEFAULT WORKFLOW for resolving PR comments with parallel execution.

MANDATORY: Background Execution

The ENTIRE workflow (Phases 0-7) MUST run as a background agent. This prevents the workflow from being sidetracked by user questions, CI failures, or context switches.

Foreground steps (do these FIRST, before launching the agent):

1. Detect PR number from args, current branch, or ask user
2. Resolve the PR branch name — run gh pr view $PR_NUM --json headRefName -q .headRefName to get the exact branch. Store as $PR_BRANCH.
3. Print: "Launching PR resolution for #$PR_NUM (branch: $PR_BRANCH) in background. You'll be notified when it completes."
4. Launch background agent with the full workflow, passing the branch name: