docs: update all project docs to reflect Phase 8 + Android work
- CLAUDE.md unified-3.1 → unified-4.0: narrowed error policy, relaxed
ECS/embed/API rules, added Android pitfalls, modal conventions (§14),
Android build guide (§15), context injection system (§16), auto-hide
HUD chrome exception in UI-first rule
- ARCHITECTURE.md: Android → Active platform; add Android to sync table;
add SafeAreaInsets + HudVisibility to Key Resources; add solitaire_wasm
- CLAUDE_SPEC.md: add solitaire_wasm crate; communication: events → events and resources
- CLAUDE_PROMPT_PACK.md: fix §8 typo; narrow dep rule to core/sync only
- SESSION_HANDOFF.md: add §5b Android UX punch list; resume prompt unified-4.0
- docs/android/PLAYABILITY_TODO.md: add P5 section (UX-1/UX-5b/UX-7/BUG-3)
- docs/SESSION_HANDOFF.md: mark as archived (Phase 2 era)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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