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.

run.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+# Idempotent setup + launch.
+#
+#   ./run.sh                        # prompts for PIN if ASCIILINE_PIN not set
+#   ASCIILINE_PIN=1234 ./run.sh     # non-interactive
+#   ./run.sh --port 8787            # extra args are passed to server.py
+#
+# Safe to re-run: skips venv creation when .venv already exists.
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "Checking ffmpeg..."
+if ! command -v ffmpeg &>/dev/null; then
+    echo
+    echo "ERROR: ffmpeg not found in PATH."
+    echo "Install it with:  brew install ffmpeg"
+    exit 1
+fi
+echo "  ffmpeg: $(ffmpeg -version 2>&1 | head -1)"
+
+if [ ! -d ".venv" ]; then
+    echo "Creating Python virtual environment..."
+    python3 -m venv .venv
+    echo "  .venv created"
+else
+    echo "  .venv already exists — skipping creation"
+fi
+
+# shellcheck disable=SC1091
+source .venv/bin/activate
+echo "  Python: $(python --version)"
+
+echo "Installing / verifying Python dependencies..."
+pip install -q -r requirements.txt
+echo "  Dependencies OK"
+
+if [ -z "${ASCIILINE_PIN:-}" ]; then
+    echo
+    read -r -s -p "Enter PIN (4-8 digits): " ASCIILINE_PIN
+    echo
+    if [ -z "$ASCIILINE_PIN" ]; then
+        echo "ERROR: PIN is required."
+        exit 1
+    fi
+fi
+export ASCIILINE_PIN
+
+echo
+echo "Starting ASCILINE YouTube Streamer..."
+echo "  Press Ctrl-C to stop (ffmpeg processes will be cleaned up automatically)"
+echo
+exec python server.py "$@"