Add local copy of OpenClaw docs for offline search

docs/cli/webhooks.md

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+---
+summary: "CLI reference for `openclaw webhooks` (webhook helpers + Gmail Pub/Sub)"
+read_when:
+  - You want to wire Gmail Pub/Sub events into OpenClaw
+  - You want webhook helper commands
+title: "webhooks"
+---
+
+# `openclaw webhooks`
+
+Webhook helpers and integrations (Gmail Pub/Sub, webhook helpers).
+
+Related:
+
+- Webhooks: [Webhook](/automation/webhook)
+- Gmail Pub/Sub: [Gmail Pub/Sub](/automation/gmail-pubsub)
+
+## Gmail
+
+```bash
+openclaw webhooks gmail setup --account [email protected]
+openclaw webhooks gmail run
+```
+
+See [Gmail Pub/Sub documentation](/automation/gmail-pubsub) for details.