Task Skill Auto PR Sync

Goal

Update the task skill so verified code-changing tracked work opens or updates the PR before any tracker comment, and any GitHub issue comment includes the PR URL.

Checklist

• [completed] Read the current task skill source and adjacent skill/repo rules
• [completed] Update .agents/rules/task.mdc with PR-before-comment behavior
• [completed] Run the skill sync step
• [completed] Verify the generated task skill reflects the new rules

Findings

• The current task skill explicitly says not to default to PR creation.
• The current GitHub sync-back section says not to mention PR mechanics in the issue comment.
• Repo rules already require check before PR creation, so the task skill should defer to that workflow instead of inventing a new one.
• pnpm run prepare runs pnpm dlx skiller@latest apply, which regenerated .codex/skills/task/SKILL.md with the new wording.