Fix supervisor merge for completed tasks and make PR command synchronousmakima/fix-supervisor-merge

## Issue 1: makima supervisor merge doesn't work for completed tasks

When a task completes, the daemon removes it from in-memory task tracking.
This caused merge operations to fail with "Task not found".

Fixed by updating handle_merge_task_to_target() to use get_task_worktree_path()
which scans the worktrees directory as a fallback when the task is not in memory.
Also updated handle_create_pr() with the same pattern for consistency.

## Issue 2: makima supervisor pr returns immediately without result

The create_pr handler was asynchronous - it sent the CreatePR command to the
daemon and immediately returned without waiting for the result.

Fixed by:
1. Adding PrResultNotification struct and pr_results broadcast channel to AppState
2. Updating mesh_daemon.rs to broadcast PRCreated results to the channel
3. Updating create_pr() handler to subscribe to pr_results and wait for the
   result with a 60-second timeout (matching the merge command pattern)

Now the PR command returns the actual pr_url and pr_number from the daemon.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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