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

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

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+# tRPC Principles
+
+> End-to-end type safety for TypeScript monorepos.
+
+## When to Use
+
+```
+✅ Perfect fit:
+├── TypeScript on both ends
+├── Monorepo structure
+├── Internal tools
+├── Rapid development
+└── Type safety critical
+
+❌ Poor fit:
+├── Non-TypeScript clients
+├── Public API
+├── Need REST conventions
+└── Multiple language backends
+```
+
+## Key Benefits
+
+```
+Why tRPC:
+├── Zero schema maintenance
+├── End-to-end type inference
+├── IDE autocomplete across stack
+├── Instant API changes reflected
+└── No code generation step
+```
+
+## Integration Patterns
+
+```
+Common setups:
+├── Next.js + tRPC (most common)
+├── Monorepo with shared types
+├── Remix + tRPC
+└── Any TS frontend + backend
+```