VTuber collab layout & audio planner

Participant count, platform, and shared-chat flag drive a simple layout blueprint and per-source audio reminders.

No account linking. Export text and paste into OBS / Twitch / YouTube yourself.

# Collab layout & audio
- Participants: 3 · Twitch · shared chat: yes

## Layout
- 1+2 grid
- - Nameplates under avatars; unified alert font

## Audio
- - Per-guest sources to separate recording tracks when possible
- - Call room on its own track vs game capture

## Roles
- Host: timing, sponsor stops, tech hold
- Mod: chat + shared chat if enabled