feat: Introduce a comprehensive set of AI agent skills, agents, and workflows, along with new UI components and application structure.

.agent/skills/api-patterns/graphql.md

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+# GraphQL Principles
+
+> Flexible queries for complex, interconnected data.
+
+## When to Use
+
+```
+✅ Good fit:
+├── Complex, interconnected data
+├── Multiple frontend platforms
+├── Clients need flexible queries
+├── Evolving data requirements
+└── Reducing over-fetching matters
+
+❌ Poor fit:
+├── Simple CRUD operations
+├── File upload heavy
+├── HTTP caching important
+└── Team unfamiliar with GraphQL
+```
+
+## Schema Design Principles
+
+```
+Principles:
+├── Think in graphs, not endpoints
+├── Design for evolvability (no versions)
+├── Use connections for pagination
+├── Be specific with types (not generic "data")
+└── Handle nullability thoughtfully
+```
+
+## Security Considerations
+
+```
+Protect against:
+├── Query depth attacks → Set max depth
+├── Query complexity → Calculate cost
+├── Batching abuse → Limit batch size
+├── Introspection → Disable in production
+```