Initial commit: ASCILINE YouTube Streamer

ASCII-art YouTube streaming for the Tesla in-car browser.

- FastAPI server on a Mac mini, no Docker.
- yt-dlp resolver: ID/URL/search.
- ffmpeg with -re -fps_mode cfr for source-paced video; trivial drain
  consumer.  Separate ffmpeg for AAC/ADTS audio.
- Vendored ASCILINE renderer (MIT) for the binary wire protocol; pure
  fillText color path, on-demand selection flush.
- HMAC PIN-gated cookie; Secure flag scheme-aware so /audio works on
  plain http during local dev.
- LOW preset (120x50 24fps) verified clean on M4: FPS 24/24, JIT ~42ms.

.gitignore

@@ -0,0 +1,21 @@
+# Python build artifacts
+.venv/
+__pycache__/
+*.pyc
+*.pyo
+*.egg-info/
+
+# Runtime / secrets
+.secret
+*.log
+
+# Process / IDE noise
+.DS_Store
+.claude/
+
+# Internal-process docs — keep README.md only
+ASCILINE-YOUTUBE-SPEC.md
+PROGRESS.md
+handover/
+docs/*.md
+vendor/asciline/PROTOCOL-NOTES.md