fix(integrations): address code-review findings

n8n: throw on FAILED memory events (was silently returned), poll on any
non-terminal status (PENDING or RUNNING), use top_k (not limit) for
search, coerce search/getAll responses to arrays, guard invalid-JSON
metadata, reject empty updates, mark user_id required; lint clean.

Zapier: coerce boolean fields (String(x) !== 'false') + boolean defaults
so "Wait"/"Infer = No" are honored, throw on HTTP >= 400 (was silent
empty/fake-success), throw on FAILED events, use top_k, numeric coercion
with clamping, mark user_id required.

integrations/n8n-nodes-mem0/.eslintrc.js

@@ -15,6 +15,12 @@ module.exports = {
 			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'],