feat: organized album directory and persistent /music bind-mount

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

worker/tests/test_library.py

@@ -0,0 +1,24 @@
+from lyra_worker.library import album_dir, safe_name
+from lyra_worker.types import MBTarget
+
+
+def test_safe_name_replaces_illegal_chars():
+    assert safe_name("AC/DC") == "AC_DC"
+    assert safe_name('a:b*c?"') == "a_b_c__"
+    assert safe_name("  .Trailing. ") == "Trailing"
+    assert safe_name("") == "Unknown"
+
+
+def test_album_dir_with_year():
+    t = MBTarget(artist="John Mayer", album="Continuum", year=2006)
+    assert album_dir("/music", t) == "/music/John Mayer/Continuum (2006)"
+
+
+def test_album_dir_without_year():
+    t = MBTarget(artist="John Mayer", album="Continuum")
+    assert album_dir("/music", t) == "/music/John Mayer/Continuum"
+
+
+def test_album_dir_sanitizes():
+    t = MBTarget(artist="AC/DC", album="Back in Black", year=1980)
+    assert album_dir("/music", t) == "/music/AC_DC/Back in Black (1980)"