Rabbitty Beta 0.1.0-beta.45

Fixes an AI Trail summary regenerate loop: the summary is now written once when the Note opens and stands until you click regenerate, instead of re-running itself every time the transcript sweep shifted the corpus underneath it (which burned a headless agent run each lap). Trail rendering fixes, plus the ⌘N worktree prompt now asks what the agent should do rather than reading as a label field.