Nudge plugins

At turn end, if Claude edited a file and no bead is in progress, shows a toast and reminds Claude at your next prompt, once per session. Reads with bd count; quiet without bd.

At turn end, if a git commit named no bead id while a bead is in progress, shows a toast and reminds Claude at your next prompt. Reads with bd count and bd where; quiet without bd.

Suggests splitting the change once your edits added or removed more than 500 lines since the last git commit. A successful commit resets the count.