Update docs, skill counts, and UX/setup-engine skills for v0.4.0

- Update skill count to 66 and hook count to 12 across README, skills-reference, and badges
- Add QA & Testing section to README and skills-reference (qa-plan, smoke-check, soak-test, etc.)
- Add Input & Platform section to technical-preferences.md (populated by /setup-engine)
- Document post-compact, notify, and validate-skill-change hooks in hooks-reference
- Expand /setup-engine, /ux-design, /ux-review, /design-system skills with input/platform context
- Restructure workflow-catalog: move UX steps into pre-production phase, improve descriptions
- Expand UPGRADING.md and WORKFLOW-GUIDE.md with v0.4.0 guidance
- Add skill-flow-diagrams examples and CODEOWNERS

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/docs/technical-preferences.md

@@ -10,6 +10,18 @@
 - **Rendering**: [TO BE CONFIGURED]
 - **Physics**: [TO BE CONFIGURED]
 
+## Input & Platform
+
+<!-- Written by /setup-engine. Read by /ux-design, /ux-review, /test-setup, /team-ui, and /dev-story -->
+<!-- to scope interaction specs, test helpers, and implementation to the correct input methods. -->
+
+- **Target Platforms**: [TO BE CONFIGURED — e.g., PC, Console, Mobile, Web]
+- **Input Methods**: [TO BE CONFIGURED — e.g., Keyboard/Mouse, Gamepad, Touch, Mixed]
+- **Primary Input**: [TO BE CONFIGURED — the dominant input for this game]
+- **Gamepad Support**: [TO BE CONFIGURED — Full / Partial / None]
+- **Touch Support**: [TO BE CONFIGURED — Full / Partial / None]
+- **Platform Notes**: [TO BE CONFIGURED — any platform-specific UX constraints]
+
 ## Naming Conventions
 
 - **Classes**: [TO BE CONFIGURED]