docs(04-02): create Phase 5 implementation roadmap
Comprehensive roadmap with 9 preliminary plans, risk analysis, and success metrics. Key insights: - JamTrack 2.5-3x more complex than Backing Track - 9 plans: Redux → Thunks → Component Core → Playback → Mixdown → Download UI → Modal → Errors → UAT - High risks: download/sync state machine, native client race conditions, fqId bugs - 5 critical decisions: popup mode, stem controls, error recovery, download cancellation, UAT threshold - Testing strategy: unit tests for Redux, integration tests for flows, comprehensive UAT checklist - Applies Phase 3 lessons: popup mode from start, race condition mitigation, performance built-in Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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