Initial implementation: single-file MTV-style music video TV channel PWA

Includes all spec features plus pop-out player with bidirectional video transfer:
- YouTube IFrame API + Data API v3 channel management
- Idle/broadcast mode, channel flip animation, NCO onboarding
- Pop-out player (⧉/P) transfers video to popup; P closes and returns it

Co-Authored-By: claude-flow <ruv@ruv.net>

CLAUDE.md

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+# VidFlow
+
+> Context for Claude/Codex is maintained in Obsidian Mind:
+> ~/my-vault/work/projects/vidflow.md
+> Run `/om-project-switch` from the vault to load full context.
+
+## Operational Rules
+
+- Single-file project — everything lives in `vidflow.html`
+- No build step, no framework, no external dependencies
+- Local dev: `python3 -m http.server 8080` (must be HTTP, not file://)
+- Never hardcode API keys