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Module 1 content polish, tool fixes, and curriculum planning

jedmund requested to merge jedmund/lesson-docs-review into main

Created by: jedmund

Summary

  • Rewrote lesson 1-2 through 1-6 content to match 1-1 quality (sensation-first openers, discovery hooks, structural fixes, tighter prose)
  • Fixed critical IntervalTrainer bug: missing semitone/displayName entries for m6/M6/m7/M7/aug4/aug5/dim5 (ear training in 1-4, 1-5, 1-6 was silently broken)
  • Added IntervalComparison tool (A/B ear training) with exercises for 1-3, 1-4, 1-5
  • Polished all 12 exercise configs (context fields, both-octave acceptance, evocative titles, collaborative instructions)
  • Added streak display and unlock toast to IntervalTrainer, retry button to IntervalClassifier
  • Wrote curriculum handoff docs for Music Theory Module 2 (Scales and Keys) and Sound Design Modules 1-3

Test plan

  • Build and run on iPad simulator
  • Walk through lessons 1-1 through 1-6 page by page
  • Verify IntervalTrainer progressive difficulty with sixths/sevenths/aug/dim
  • Verify IntervalComparison A/B playback and answer flow
  • Verify no back-to-back modal pages in any lesson
  • Verify all exercise_refs resolve correctly

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