docs: redirect /install/node to install section

docs/help/index.md

@@ -10,7 +10,7 @@ read_when:
 If you want a quick “get unstuck” flow, start here:
 
 - **Troubleshooting:** [Start here](/help/troubleshooting)
-- **Install sanity (Node/npm/PATH):** [Node.js + npm (PATH sanity)](/install/node)
+- **Install sanity (Node/npm/PATH):** [Install](/install#nodejs--npm-path-sanity)
 - **Gateway issues:** [Gateway troubleshooting](/gateway/troubleshooting)
 - **Logs:** [Logging](/logging) and [Gateway logging](/gateway/logging)
 - **Repairs:** [Doctor](/gateway/doctor)

docs/help/troubleshooting.md

@@ -31,7 +31,7 @@ clawdbot status --deep
 
 Almost always a Node/npm PATH issue. Start here:
 
-- [Node.js + npm (PATH sanity)](/install/node)
+- [Install (Node/npm PATH sanity)](/install#nodejs--npm-path-sanity)
 
 ### Gateway “unauthorized”, can’t connect, or keeps reconnecting