test: update musical time tests to match corrected fractional_beat behavior

- Fix test timing values to land between pulses when expecting fractional values
- Update expected fractional_beat values to match pulse-based calculation
- Update test comments to reflect corrected behavior where fractional_beat
  is always between pulses regardless of reference_level

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: jon-myers

idtap/tests/musical_time_test.py

@@ -81,7 +81,7 @@ def test_regular_meter_default_level(self):
         """Test Case 1 from spec: Regular meter with default level."""
         meter = Meter(hierarchy=[4, 4], tempo=240, start_time=0, repetitions=3)  # Extended to 3 repetitions
 
-        result = meter.get_musical_time(2.375)  # This is now in the 3rd cycle
+        result = meter.get_musical_time(2.40625)  # Halfway between subdivision 2 and 3 in 3rd cycle
 
         assert result is not False
         assert result.cycle_number == 2  # Third cycle (0-indexed)
@@ -105,12 +105,12 @@ def test_reference_level_subdivision(self):
         """Test Case 3 from spec: Reference level at subdivision level."""
         meter = Meter(hierarchy=[4, 4], tempo=240, start_time=0, repetitions=2)
 
-        result = meter.get_musical_time(0.375, reference_level=1)  # Beat 1, subdivision 2, halfway through beat
+        result = meter.get_musical_time(0.40625, reference_level=1)  # Beat 1, subdivision 2, halfway between pulses
 
         assert result is not False
         assert result.cycle_number == 0
         assert result.hierarchical_position == [1, 2]  # Beat 2, subdivision 3
-        assert abs(result.fractional_beat - 0.5) < 0.01  # 50% through beat (ref_level=1 = within beat)
+        assert abs(result.fractional_beat - 0.5) < 0.01  # 50% between pulses (fractional_beat always pulse-based)
         assert str(result) == "C0:1.2+0.500"
 
     def test_johns_specific_examples(self):
@@ -348,7 +348,7 @@ def test_recursive_overflow_edge_case(self):
         result = meter.get_musical_time(time_at_subdivision_boundary, reference_level=0)
         assert result is not False
         assert result.beat == 0
-        assert abs(result.fractional_beat - 0.4995) < 0.001  # 49.95% through cycle (ref_level=0 = within cycle)
+        assert abs(result.fractional_beat - 0.997) < 0.01  # 99.7% between pulses (fractional_beat always pulse-based)
 
         # Same time with subdivision reference should handle overflow correctly
         result = meter.get_musical_time(time_at_subdivision_boundary, reference_level=1)