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/.eslintrc.js

@@ -0,0 +1,31 @@
+module.exports = {
+	root: true,
+	env: { browser: true, es6: true, node: true },
+	parser: '@typescript-eslint/parser',
+	parserOptions: { sourceType: 'module', extraFileExtensions: ['.json'] },
+	ignorePatterns: ['.eslintrc.js', '**/*.js', '**/node_modules/**', '**/dist/**'],
+	overrides: [
+		{
+			files: ['package.json'],
+			plugins: ['eslint-plugin-n8n-nodes-base'],
+			extends: ['plugin:n8n-nodes-base/community'],
+			rules: { 'n8n-nodes-base/community-package-json-name-still-default': 'off' },
+		},
+		{
+			files: ['./credentials/**/*.ts'],
+			plugins: ['eslint-plugin-n8n-nodes-base'],
+			extends: ['plugin:n8n-nodes-base/credentials'],
+			rules: {
+				// This rule only applies to nodes in n8n's main repository (where
+				// documentationUrl is an internal docs slug). Community nodes use a
+				// full external URL, so it is disabled here.
+				'n8n-nodes-base/cred-class-field-documentation-url-miscased': 'off',
+			},
+		},
+		{
+			files: ['./nodes/**/*.ts'],
+			plugins: ['eslint-plugin-n8n-nodes-base'],
+			extends: ['plugin:n8n-nodes-base/nodes'],
+		},
+	],
+};