fix: remove tests for nonexistent annotate/ax params in plot_pitch_prevalence

These tests referenced parameters from an earlier draft that were dropped
when the function was rewritten to match the web app's table-style grid.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jon-myers

idtap/tests/visualization_test.py

@@ -151,25 +151,12 @@ def test_returns_figure_duration(self):
         assert fig is not None
         plt.close(fig)
 
-    def test_with_annotation(self):
-        piece = _mock_piece()
-        fig = plot_pitch_prevalence(piece, annotate=True)
-        assert fig is not None
-        plt.close(fig)
-
     def test_chroma_output(self):
         piece = _mock_piece()
         fig = plot_pitch_prevalence(piece, output_type='chroma')
         assert fig is not None
         plt.close(fig)
 
-    def test_with_existing_axes(self):
-        fig, ax = plt.subplots()
-        piece = _mock_piece()
-        returned_fig = plot_pitch_prevalence(piece, ax=ax)
-        assert returned_fig is fig
-        plt.close(fig)
-
     def test_unknown_segmentation_raises(self):
         piece = _mock_piece()
         with pytest.raises(ValueError, match='Unknown segmentation'):