pi/agent: non-blocking /btw, live loop countdown, persistent prompt history

btw: replace blocking overlay with non-blocking widget
- Fire LLM call in background; return immediately so user can keep typing
- Show loading widget below editor while answering
- Display answer in same widget when ready; dismiss with /btw close
- Remove BtwOverlay and wrapText helpers (no longer needed)

loop-scheduler: update countdown every second
- Add startUiTick/stopUiTick (1s setInterval) so the "in Xs" countdown
  in the scheduled-loops widget refreshes live instead of staying stale
- Tick starts automatically when jobs exist, stops when all are removed
  or the session shuts down

prompt-history: persist editor input history across session restarts
- New extension saves every submitted prompt to ~/.pi/prompt-history.json
  (up to 500 entries) via before_agent_start
- On session_start, reads the file, merges with in-memory editor history
  (deduplicating), and re-seeds the editor so up-arrow history survives
  process restarts and new sessions
- Requires addToHistory/getHistory on ctx.ui (patched into pi-coding-agent
  dist/modes/interactive/interactive-mode.js and types.d.ts)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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