feat: add --record flag for meeting video recording

[ocean-wave-ai]

Summary

Adds a --record flag to openutter join that captures a video recording of the meeting session using Playwright built-in recordVideo API.

Closes #3

Changes

• scripts/utter-join.ts:

  • Parse new --record CLI flag
  • Pass record option through to joinMeeting()
  • Configure recordVideo: { dir, size } on all browser context creation paths (auth, non-auth, and retry contexts)
  • After meeting ends, rename temp WebM to <meeting-id>.webm in ~/.openclaw/workspace/openutter/recordings/
  • Best-effort MP4 conversion via ffmpeg (falls back to WebM if unavailable)
  • Send channel notification with recording path

• bin/openutter.mjs:

  • Add --record to help text and examples

Usage

# Record + transcript (auth mode)
npx openutter join https://meet.google.com/abc-defg-hij --auth --record

# Record + transcript with duration limit
npx openutter join https://meet.google.com/abc-defg-hij --auth --record --duration 60m

# Record in anonymous mode
npx openutter join https://meet.google.com/abc-defg-hij --anon --bot-name "Recorder" --record

How it works

1. Playwright recordVideo captures the browser viewport at 1280x720
2. The recording shows what the bot sees: participant grid, screen shares, etc.
3. After meeting ends, the temp WebM file is renamed to <meeting-id>.webm
4. If ffmpeg is on PATH, auto-converts to MP4 (H.264 + AAC) for broader compatibility
5. Recording path is sent to the channel (if --channel/--target specified)

Notes

• No new dependencies — uses Playwright built-in API + optional system ffmpeg
• Recording files can be 50-100MB/hour — documented in the issue
• Works with both --auth and --anon join modes
• Recording persists across retry contexts (fresh incognito on join block)