docs(cli): add per-command CLI pages

docs/cli/agent.md

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+---
+summary: "CLI reference for `clawdbot agent` (send one agent turn via the Gateway)"
+read_when:
+  - You want to run one agent turn from scripts (optionally deliver reply)
+---
+
+# `clawdbot agent`
+
+Run an agent turn via the Gateway (use `--local` for embedded).
+
+Related:
+- Agent send tool: [Agent send](/tools/agent-send)
+
+## Examples
+
+```bash
+clawdbot agent --to +15555550123 --message "status update" --deliver
+clawdbot agent --session-id 1234 --message "Summarize inbox" --thinking medium
+```
+