chore(integrations): address review — Zapier LICENSE, docs, tidy job names

- Add MIT LICENSE to zapier-mem0 (package.json declared MIT but shipped no
  file; every peer commits one) + keywords/author/homepage for parity.
- Document the n8n and Zapier checks workflows in the AGENTS.md CI table.
- Title-case the ci-gate job display names (n8n Node, Zapier App) to match
  the other integration jobs.

integrations/zapier-mem0/package.json

@@ -2,6 +2,18 @@
   "name": "zapier-mem0",
   "version": "0.1.0",
   "description": "Zapier integration for Mem0 — the memory layer for AI agents.",
+  "keywords": [
+    "zapier",
+    "mem0",
+    "memory",
+    "ai",
+    "agents"
+  ],
+  "homepage": "https://mem0.ai",
+  "author": {
+    "name": "Mem0",
+    "email": "founders@mem0.ai"
+  },
   "repository": {
     "type": "git",
     "url": "https://github.com/mem0ai/mem0",