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>

CLAUDE_SPEC.md

@@ -41,6 +41,10 @@ solitaire_server:
 depends_on: [solitaire_sync, axum, sqlx, jsonwebtoken]
 role: "backend"
 
+solitaire_wasm:
+depends_on: [solitaire_core, wasm-bindgen, serde-wasm-bindgen]
+role: "wasm_replay_player"
+
 solitaire_app:
 depends_on: [solitaire_engine]
 role: "entrypoint"
@@ -180,7 +184,7 @@ threading:
 
 plugins:
 pattern: "feature_isolation"
-communication: "events"
+communication: "events and resources"
 
 ---