feat(angular): Add metadata.json and README.md to all Angular skills

- Add metadata.json with version tracking, organization, and references
- Add README.md with skill overviews, usage guides, and quick references
- Brings Angular skills to parity with React Best Practices infrastructure
- Covers: angular, angular-state-management, angular-ui-patterns, angular-best-practices

skills/angular-state-management/README.md

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+# Angular State Management
+
+Complete state management patterns for Angular applications optimized for AI agents and LLMs.
+
+## Overview
+
+This skill provides decision frameworks and implementation patterns for:
+
+- **Signal-based Services** - Lightweight state for shared data
+- **NgRx SignalStore** - Feature-scoped state with computed values
+- **NgRx Store** - Enterprise-scale global state management
+- **RxJS ComponentStore** - Reactive component-level state
+- **Forms State** - Reactive and template-driven form patterns
+
+## Structure
+
+The `SKILL.md` file is organized into:
+
+1. **State Categories** - Local, shared, global, server, URL, and form state
+2. **Selection Criteria** - Decision trees for choosing the right solution
+3. **Implementation Patterns** - Complete examples for each approach
+4. **Migration Guides** - Moving from BehaviorSubject to Signals
+5. **Bridging Patterns** - Integrating Signals with RxJS
+
+## When to Use Each Pattern
+
+- **Signal Service**: Shared UI state (theme, user preferences)
+- **NgRx SignalStore**: Feature state with computed values
+- **NgRx Store**: Complex cross-feature dependencies
+- **ComponentStore**: Component-scoped async operations
+- **Reactive Forms**: Form state with validation
+
+## Version
+
+Current version: 1.0.0 (February 2026)
+
+## References
+
+- [Angular Signals](https://angular.dev/guide/signals)
+- [NgRx](https://ngrx.io)
+- [NgRx SignalStore](https://ngrx.io/guide/signals)

skills/angular-state-management/metadata.json

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+{
+  "version": "1.0.0",
+  "organization": "Antigravity Awesome Skills",
+  "date": "February 2026",
+  "abstract": "Complete state management guide for Angular applications designed for AI agents and LLMs. Covers Signal-based services, NgRx for global state, RxJS patterns, and component stores. Includes decision trees for choosing the right solution, migration patterns from BehaviorSubject to Signals, and strategies for bridging Signals with RxJS observables.",
+  "references": [
+    "https://angular.dev/guide/signals",
+    "https://ngrx.io",
+    "https://ngrx.io/guide/signals",
+    "https://www.rx-angular.io",
+    "https://github.com/ngrx/platform"
+  ]
+}