feat: add comprehensive skills and agents for Rust development (#1573)

.cursor/agents/docs-cache.md

@@ -0,0 +1,41 @@
+# docs-cache
+
+Documentation cache helper for agents.
+
+## Cache Directory
+
+```
+~/.claude/cache/rust-docs/
+├── docs.rs/{crate}/{item}.json
+├── std/{module}/{item}.json
+├── releases.rs/{version}.json
+├── lib.rs/{crate}.json
+└── clippy/{lint}.json
+```
+
+## TTL by Source
+
+| Source | TTL | Reason |
+|--------|-----|--------|
+| std/ | 30 days | Stable |
+| docs.rs/ | 7 days | Crate updates |
+| releases.rs/ | 365 days | Historical |
+| lib.rs/ | 1 day | Version changes |
+| clippy/ | 14 days | Rust version updates |
+
+## Cache Format
+
+```json
+{
+  "meta": {
+    "url": "...",
+    "fetched_at": "2025-01-01T00:00:00Z",
+    "expires_at": "2025-01-08T00:00:00Z"
+  },
+  "content": { ... }
+}
+```
+
+## Skip Cache
+
+Keywords: refresh, force, --force, update docs