fix(zapier): address review feedback (masked key, ES imports) + test hygiene

- authentication: API key field is now type 'password' so Zapier masks it in
  the connection UI instead of showing it in cleartext.
- index: use ES imports for the platform version and package version instead of
  require(), matching the repo's TypeScript rule. dist stays flat; both versions
  resolve at runtime.
- AGENTS.md: add the Key Directories row for integrations/zapier-mem0.
- tests: disable telemetry during test runs so CI never fires real PostHog
  events, which also removes a lingering open handle after the suite.

Verified: build + zapier validate (0 failures) + 16 tests (13 unit, 3 live E2E).

integrations/zapier-mem0/package.json

@@ -36,6 +36,7 @@
   "jest": {
     "testEnvironment": "node",
     "testMatch": ["**/test/**/*.test.ts"],
+    "setupFiles": ["<rootDir>/test/setup.ts"],
     "transform": {
       "^.+\\.tsx?$": ["ts-jest", {}]
     }

integrations/zapier-mem0/src/authentication.ts

@@ -11,7 +11,8 @@ export default {
 		{
 			key: 'apiKey',
 			label: 'Mem0 API Key',
-			type: 'string',
+			// `password` so Zapier masks the key in the connection UI (it is a secret).
+			type: 'password',
 			required: true,
 			helpText:
 				'Your Mem0 API key (starts with `m0-`). Create one at [app.mem0.ai](https://app.mem0.ai) → Settings → API Keys.',

integrations/zapier-mem0/src/index.ts

@@ -1,16 +1,14 @@
+import { version as platformVersion } from 'zapier-platform-core';
 import authentication from './authentication';
 import { includeApiKey, handleBadResponses } from './middleware';
 import addMemory from './creates/add_memory';
 import deleteMemory from './creates/delete_memory';
 import searchMemories from './searches/search_memories';
 import getMemories from './searches/get_memories';
-
-// Read version at runtime from the package manifest (one directory up from dist/).
-const { version } = require('../package.json');
-const platformVersion = require('zapier-platform-core').version;
+import pkg from '../package.json';
 
 const app = {
-	version,
+	version: pkg.version,
 	platformVersion,
 
 	authentication,

integrations/zapier-mem0/test/setup.ts

@@ -0,0 +1,3 @@
+// Disable telemetry during tests so runs never fire real PostHog events
+// (and so the fire-and-forget fetch cannot leave an open handle after tests).
+process.env.MEM0_TELEMETRY = 'false';