v0.1.4: playback-control provenance log

LinTunes has spontaneously resumed playback for ~4s (then paused) four
times while trav was away — suspected phantom media-key events from the
Audioengine USB DAC's HID 'keyboard', but the pathway (MPRIS vs the
focused-window key filter) is unproven. Every control path now drops a
timestamped line in ~/.cache/lintunes/control-events.log: MPRIS Player
methods, the media-key eventFilter (with source input device where the
compositor exposes it), and Player.toggle_play/pause with position. New
lintunes/eventlog.py, 1MB rotation, never raises; conftest autouse
fixture keeps tests off the real log file.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/conftest.py

@@ -8,6 +8,15 @@ import pytest
 os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
 
 
+@pytest.fixture(autouse=True)
+def _isolate_eventlog(tmp_path, monkeypatch):
+    """Keep the control-provenance log out of the real ~/.cache during tests
+    (Player/MPRIS methods log unconditionally)."""
+    from lintunes import eventlog
+    monkeypatch.setattr(eventlog, "_log_path",
+                        lambda: tmp_path / "control-events.log")
+
+
 @pytest.fixture(scope="session")
 def qapp():
     """A Qt application so QObject/QTimer and real widgets work in tests.