docs(cli): add per-command CLI pages

docs/cli/nodes.md

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+---
+summary: "CLI reference for `clawdbot nodes` (list/status/approve/invoke, camera/canvas/screen)"
+read_when:
+  - You’re managing paired nodes (cameras, screen, canvas)
+  - You need to approve requests or invoke node commands
+---
+
+# `clawdbot nodes`
+
+Manage paired nodes (devices) and invoke node capabilities.
+
+Related:
+- Nodes overview: [Nodes](/nodes)
+- Camera: [Camera nodes](/nodes/camera)
+- Images: [Image nodes](/nodes/images)
+
+## Common commands
+
+```bash
+clawdbot nodes list
+clawdbot nodes pending
+clawdbot nodes approve <requestId>
+clawdbot nodes status
+```
+
+## Invoke / run
+
+```bash
+clawdbot nodes invoke --node <id|name|ip> --command <command> --params <json>
+clawdbot nodes run --node <id|name|ip> <command...>
+```
+