refactor(server): register loaded module in sys.modules, add __all__

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/mf.py

@@ -4,6 +4,7 @@ between the REST API and the CLI; musicfetch itself is unchanged."""
 import importlib.machinery
 import importlib.util
 import os
+import sys
 
 _HERE = os.path.dirname(os.path.abspath(__file__))
 _MF_PATH = os.environ.get("MUSICFETCH_BIN", os.path.join(_HERE, "..", "musicfetch"))
@@ -14,6 +15,7 @@ _loader = importlib.machinery.SourceFileLoader("musicfetch_core", _MF_PATH)
 _spec = importlib.util.spec_from_loader("musicfetch_core", _loader)
 _mod = importlib.util.module_from_spec(_spec)
 _spec.loader.exec_module(_mod)  # safe: musicfetch guards main() behind __main__
+sys.modules["musicfetch_core"] = _mod
 
 Hit = _mod.Hit
 build_combined_hits = _mod.build_combined_hits
@@ -22,3 +24,6 @@ act_youtube = _mod.act_youtube
 act_lidarr_album = _mod.act_lidarr_album
 act_lidarr_artist = _mod.act_lidarr_artist
 QUALITY_CHOICES = _mod.QUALITY_CHOICES
+
+__all__ = ["Hit", "build_combined_hits", "pick", "act_youtube",
+           "act_lidarr_album", "act_lidarr_artist", "QUALITY_CHOICES"]

tests/test_mf_loader.py

@@ -1,3 +1,6 @@
+"""Tests for the server.mf loader."""
+
+
 def test_mf_reexports_musicfetch_symbols():
     from server import mf
     assert hasattr(mf, "Hit")
@@ -6,6 +9,7 @@ def test_mf_reexports_musicfetch_symbols():
     assert callable(mf.act_youtube)
     assert callable(mf.act_lidarr_album)
     assert callable(mf.act_lidarr_artist)
+    assert isinstance(mf.QUALITY_CHOICES, list)
 
 
 def test_mf_hit_constructs():