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Module 2: Scales & Keys tools and lesson content

jedmund requested to merge jedmund/m2-scale-tools into jedmund/module-2-integration

Created by: jedmund

Summary

  • Extended scale_builder to support WH (3 half step) patterns for harmonic minor and pentatonic scales
  • Adjusted interval_classifier playback timing for 7-8 note scale stimuli (0.25s/note vs 0.4s for intervals)
  • Added degree label overlay system: circled numbers above keyboard keys with tap-to-expand names
  • Added accented pitch (orange tint) and selected pitch (accent border) states to SynthKeyboardView
  • Built 3 new exercise tools: scale_explorer (pill toggles, difference highlighting), key_signature_quiz (accidental display, identify key/accidentals), mode_rotator (tap-to-select tonic, dynamic step arcs)
  • Authored all 6 lessons covering scale degrees, key signatures, minor scales, harmonic/melodic minor, modes, and pentatonic/blues
  • 19 exercise configs across scale_builder, scale_explorer, key_signature_quiz, mode_rotator, interval_classifier, and playable_keyboard
  • 6 checks (5 questions each), 12 hardware prompts, 6 markdown companions

Test plan

  • Build succeeds on iPad simulator
  • Walk through all 6 lessons page by page, verify no layout issues
  • Verify degree_labels render on keyboard_diagram blocks in lessons 2-1 and 2-3
  • Verify scale_builder handles WH pattern in lessons 2-4 and 2-6
  • Verify interval_classifier plays 8-note scale stimuli at faster tempo
  • Test scale_explorer pill toggles and difference highlighting
  • Test key_signature_quiz in both identify_key and identify_accidentals modes
  • Test mode_rotator tap-to-select and step arc recomputation
  • Verify all exercise_refs resolve to working exercises
  • Verify no back-to-back modal layouts in any lesson

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