fix(merge): drop worktree cleanup step

The aoe-ownership check and its warning were noise on every merge; cleanup is the user's call.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

commands/merge.md

@@ -47,22 +47,5 @@ instead — checkout the default branch, `git merge <branch> --no-edit`, push.
 
 # Cleanup
 
-Check whether Agent of Empires owns this worktree first. `aoe session current`
-resolves from the tmux environment, not the cwd, so confirm the session's `Path`
-is actually this worktree:
-
-```
-S=$(aoe session current -q) && aoe session show "$S" | grep Path
-```
-
-- **The path matches this worktree** → aoe owns the worktree and the branch. Do not
-  run `git worktree remove` or delete the branch; that strands the session and
-  deletes the directory you are running in. Report the merge, then hand me the
-  command and stop:
-
-  ```
-  aoe remove <session> --delete-worktree --delete-branch
-  ```
-
-- **No session, or the path points elsewhere** → the worktree is plain git.
-  Delete the local worktree and branch yourself.
+None. Never remove the worktree or delete the branch, and never check who owns
+them — I handle cleanup myself. Report the merge and stop.