docs(cli): add per-command CLI pages

docs/cli/hooks.md

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+---
+summary: "CLI reference for `clawdbot hooks` (Gmail Pub/Sub + webhook helpers)"
+read_when:
+  - You want to wire Gmail Pub/Sub events into Clawdbot hooks
+  - You want to run the gog watch service and renew loop
+---
+
+# `clawdbot hooks`
+
+Webhook helpers and hook-based integrations.
+
+Related:
+- Webhooks: [Webhook](/automation/webhook)
+- Gmail Pub/Sub: [Gmail Pub/Sub](/automation/gmail-pubsub)
+
+## Gmail
+
+```bash
+clawdbot hooks gmail setup --account you@example.com
+clawdbot hooks gmail run
+```
+