feat: Add design system persistence with Master + Overrides pattern (#91)

- Add --persist flag to save design system to design-system/MASTER.md
- Add --page flag to create page-specific override files in design-system/pages/
- MASTER.md includes hierarchical override logic header, color palette, typography, spacing, shadows, component specs, and anti-patterns
- Page override files are templates for documenting deviations from Master
- Updated documentation for all AI assistants (Claude, Cursor, Windsurf, Kiro, Qoder, Roo)
- Updated README.md with usage examples

This enables persistent design context across chat sessions using a 'Master + Overrides' pattern where page-specific rules override the global design system.

README.md

@@ -359,6 +359,41 @@ python3 .claude/skills/ui-ux-pro-max/scripts/search.py "form validation" --stack
 python3 .claude/skills/ui-ux-pro-max/scripts/search.py "responsive layout" --stack html-tailwind
 ```
 
+### Persist Design System (Master + Overrides Pattern)
+
+Save your design system to files for **hierarchical retrieval across sessions**:
+
+```bash
+# Generate and persist to design-system/MASTER.md
+python3 .claude/skills/ui-ux-pro-max/scripts/search.py "SaaS dashboard" --design-system --persist -p "MyApp"
+
+# Also create a page-specific override file
+python3 .claude/skills/ui-ux-pro-max/scripts/search.py "SaaS dashboard" --design-system --persist -p "MyApp" --page "dashboard"
+```
+
+This creates a `design-system/` folder structure:
+
+```
+design-system/
+├── MASTER.md           # Global Source of Truth (colors, typography, spacing, components)
+└── pages/
+    └── dashboard.md    # Page-specific overrides (only deviations from Master)
+```
+
+**How hierarchical retrieval works:**
+1. When building a specific page (e.g., "Checkout"), first check `design-system/pages/checkout.md`
+2. If the page file exists, its rules **override** the Master file
+3. If not, use `design-system/MASTER.md` exclusively
+
+**Context-aware retrieval prompt:**
+```
+I am building the [Page Name] page. Please read design-system/MASTER.md.
+Also check if design-system/pages/[page-name].md exists.
+If the page file exists, prioritize its rules.
+If not, use the Master rules exclusively.
+Now, generate the code...
+```
+
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