docs: add 12 PRD cross-reference gaps + platform dependency blockers to V2 review
New findings from systematic PRD ↔ roadmap comparison:
- X-01: Windows/Tauri in PRD but missing from roadmap entirely
- X-02: Event countdown timer type never scheduled in any phase
- X-03: Cascade preset names don't match (PRD vs roadmap)
- X-04: Phase 3 timeline differs (PRD 3wks vs roadmap 4wks)
- X-05: Success metrics contradict between documents
- X-06: Open-source stated in PRD, never discussed in roadmap
- X-07: AI suggestions feature in PRD, absent from roadmap
- X-08: Neurodivergent mode toggle vs default contradicts PRD decision
- X-09: ChronoMind design tokens (--cm-*) conflict with ByteLyst
- X-10: Typography differs (Inter/JetBrains vs DM Sans/IBM Plex)
- X-11: Timer engine architecture unclear (SW vs requestAnimationFrame)
- X-12: Extraction service unused for NL parsing upgrade path
Platform dependency blockers identified from PLATFORM_COMPONENTS_ROADMAP:
- Email/Push Delivery, Password Reset, Event Bus, Scheduled Jobs
- Mitigation: Phase 1-3 unblocked, Phase 4+ has fallbacks
Added @bytelyst/extraction to reusable packages table
Added 4 new decisions to Appendix B (open-source, Windows, AKV, fonts)
Total findings: 7 bugs + 7 arch gaps + 10 missing features + 12 PRD gaps + 5 blockers
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