feat(integrations): add n8n community node for Mem0

A programmatic n8n community node wrapping the hosted Mem0 v3 REST API:
add, search, get, get-many, update, delete, plus usableAsTool so the n8n
AI Agent can call it.

- Zero runtime dependencies (calls REST directly), TypeScript, ESLint clean —
  meets n8n verified-node requirements
- Add supports custom_instructions, custom_categories, includes, excludes,
  a client-side entity-id guard, and async event polling (itemIndex on errors)
- Anonymous opt-out telemetry (MEM0_TELEMETRY=false)
- Docs page + docs.json/llms.txt entry, ci-gate + release wiring, AGENTS.md rows
- Verified: tsc + ESLint + live E2E (add → search → get → delete) vs api.mem0.ai

Split out of #6057 per review (separate PRs per integration).

integrations/n8n-nodes-mem0/tsconfig.json

@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "strict": true,
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "target": "es2019",
+    "lib": ["es2019", "es2020", "es2022.error"],
+    "removeComments": true,
+    "useUnknownInCatchVariables": false,
+    "forceConsistentCasingInFileNames": true,
+    "noImplicitAny": true,
+    "noImplicitReturns": true,
+    "noUnusedLocals": true,
+    "strictNullChecks": true,
+    "preserveConstEnums": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "incremental": true,
+    "declaration": true,
+    "sourceMap": true,
+    "skipLibCheck": true,
+    "outDir": "./dist/"
+  },
+  "include": ["credentials/**/*", "nodes/**/*"],
+  "exclude": ["node_modules", "dist"]
+}