Add project skeleton: CLI pipeline for CD digitization

Modular Python package with Typer CLI (scan/apply/process commands),
Pydantic data models, OCR via Tesseract, LLM-based tracklist parsing,
mutagen audio tagging, M3U playlist generation, and cover processing.
Includes 8 passing tests and ruff lint config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/musiksammlung/ripper.py

@@ -0,0 +1,57 @@
+"""CD-Ripping via abcde."""
+
+from __future__ import annotations
+
+import logging
+import subprocess
+from pathlib import Path
+
+logger = logging.getLogger(__name__)
+
+
+def rip_disc(
+    device: str,
+    output_dir: Path,
+    audio_format: str = "flac",
+    eject: bool = True,
+) -> Path:
+    """Rippt eine CD mit abcde in output_dir.
+
+    Args:
+        device: CD-Laufwerk, z.B. '/dev/cdrom'
+        output_dir: Zielverzeichnis für die gerippten Dateien
+        audio_format: Ausgabeformat (flac, mp3, ogg, opus)
+        eject: CD nach dem Rippen auswerfen
+
+    Returns:
+        Pfad zum Verzeichnis mit den gerippten Dateien
+    """
+    output_dir.mkdir(parents=True, exist_ok=True)
+
+    cmd = [
+        "abcde",
+        "-n",       # kein CDDB-Lookup
+        "-N",       # non-interaktiv
+        "-p",       # führende Nullen bei Tracknummern
+        "-o", audio_format,
+        "-d", device,
+        "-D",       # kein Debug
+    ]
+    if eject:
+        cmd.append("-x")
+
+    logger.info("Starte Ripping: %s", " ".join(cmd))
+
+    result = subprocess.run(
+        cmd,
+        cwd=str(output_dir),
+        capture_output=True,
+        text=True,
+    )
+
+    if result.returncode != 0:
+        logger.error("abcde Fehler: %s", result.stderr)
+        raise RuntimeError(f"abcde fehlgeschlagen (exit {result.returncode}): {result.stderr}")
+
+    logger.info("Ripping abgeschlossen: %s", output_dir)
+    return output_dir