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

.agent/skills/api-patterns/rate-limiting.md

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+# Rate Limiting Principles
+
+> Protect your API from abuse and overload.
+
+## Why Rate Limit
+
+```
+Protect against:
+├── Brute force attacks
+├── Resource exhaustion
+├── Cost overruns (if pay-per-use)
+└── Unfair usage
+```
+
+## Strategy Selection
+
+| Type | How | When |
+|------|-----|------|
+| **Token bucket** | Burst allowed, refills over time | Most APIs |
+| **Sliding window** | Smooth distribution | Strict limits |
+| **Fixed window** | Simple counters per window | Basic needs |
+
+## Response Headers
+
+```
+Include in headers:
+├── X-RateLimit-Limit (max requests)
+├── X-RateLimit-Remaining (requests left)
+├── X-RateLimit-Reset (when limit resets)
+└── Return 429 when exceeded
+```