wraplisted

Wrap up the current PR and session. This is the "we're done here" command that handles final verification through merge, root-main sync, follow-up detection, a full-session sweep for loose ends, and lessons. `/wrap` accepts an **optional** PR reference as its argument — a full URL, `#N`, `owner/repo#N`, or a bare number `N`. When invoked with no argument it resolves the target PR through the inference cascade in Step 1.1 (current branch → thread context → session-state). An explicit argument bypasses all inference. `/wrap` does **not** delete the running worktree or its branch — leaving the thread alive so it can keep working. Stale worktrees and stale local/remote branches are reaped out-of-band by `/pm-update`, which calls `stale-cleanup.sh`. ## When to use /wrap vs /merge - Use **/wrap** at end-of-session. Handles merge + root-main sync + follow-up detection + lessons. - Use **/merge** for a quick mid-session merge when you'll keep working. Skips follow-up detection and lessons. - /wrap includes everything /merge does, plus follow-ups and lessons. Don't run both. - Phase C invokes this skill after gate and AC verification; keep merge, main-sync, follow-up, and cleanup behavior here so Phase C and `/wrap` cannot drift. - **Target PR:** `/wrap` operates on the PR resolved in Step 1.1. Pass an explicit reference (`/wrap <URL>`, `/wrap #N`, `/wrap N`) to wrap a PR that is **not** on the current branch — common in orchestration threads that ran `/fixpr <URL>` against anothe