feat: add Datadog connector AI coder skill

plugins/shared/skills/resources_datadog/SKILL.md

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+---
+name: using-datadog-connector
+description: Implements Datadog API requests with automatic auth header injection using HTTP proxy and MCP tools. Use when doing ANYTHING that touches a Datadog resource.
+---
+
+# Major Platform Resource: Datadog
+
+## Common: Interacting with Resources
+
+**Security**: Never connect directly to APIs. Never use credentials in code. Always use MCP tools or the HTTP proxy.
+
+**Two ways to interact with Datadog:**
+
+1. **MCP tools** (direct, no code needed): Datadog's hosted MCP tools are available through the connector. Use `mcp__resources__list_resources` to discover resources.
+2. **HTTP proxy** (Next.js apps): Use `createProxyFetch` from `@major-tech/resource-client/next` to call the Datadog REST API with automatic auth injection.
+
+**Error handling**: Always check response status codes. Datadog returns standard HTTP errors.
+
+## HTTP Proxy Usage
+
+```typescript
+import { createProxyFetch } from "@major-tech/resource-client/next";
+
+const ddFetch = createProxyFetch({ resourceId: "your-resource-id" });
+
+// Query metrics
+const response = await ddFetch("/api/v1/query?query=avg:system.cpu.user{*}&from=...&to=...");
+const data = await response.json();
+
+// List monitors
+const monitors = await ddFetch("/api/v1/monitor");
+
+// Search logs
+const logs = await ddFetch("/api/v2/logs/events/search", {
+  method: "POST",
+  headers: { "Content-Type": "application/json" },
+  body: JSON.stringify({
+    filter: { query: "service:my-service status:error", from: "now-1h", to: "now" },
+    page: { limit: 25 },
+  }),
+});
+```
+
+## Tips
+
+- **Paths are relative to the region-specific API base URL** (e.g., `api.datadoghq.com` for US1)
+- **Auth headers (DD-API-KEY and DD-APPLICATION-KEY) are automatically injected** — never set them manually
+- Datadog API is versioned: `/api/v1/...` and `/api/v2/...` — check Datadog docs for the correct version
+- **Rate limits**: Datadog enforces rate limits per endpoint; check `X-RateLimit-*` response headers
+- **Pagination**: Many list endpoints support `page[limit]` and `page[offset]` or cursor-based pagination