DEPLOY.md: remove the 'agent on 92 can't reach 186:3452' section

The user's micro agent dials ws://172.18.139.186:3452/ws/agent
directly, bypassing nginx. The 'add a /ws/agent nginx proxy
block' workaround was for a different topology where the
agent goes through nginx on 80, which doesn't apply here.

That section was confusing — it suggested an nginx change
the user doesn't need. Delete it.

DEPLOY.md

@@ -198,31 +198,6 @@ ExecStart=/home/administrator/SDP/bin/agent-micro -node micro -cp ws://172.18.13
 
 (Remove the `Environment=` / `EnvironmentFile=` / `${SDP_CP_URL}` lines.) Do the same for `systemd/sdp-agent-gateway.service` (URL is `ws://127.0.0.1:3452/ws/agent`). Re-do steps 7 and 8.
 
-### Micro agent on 92 can't reach the control plane on 186:3452
-
-Symptom: `sdp-agent-micro.service` journal shows `dial: ... connection refused` or `i/o timeout` to `172.18.139.186:3452`.
-
-Fix: add a `/ws/agent` proxy block to 186's nginx (alongside the four from `nginx/sandbox.conf`):
-
-```nginx
-location /ws/agent {
-    proxy_pass http://127.0.0.1:3452;
-    proxy_http_version 1.1;
-    proxy_set_header Upgrade $http_upgrade;
-    proxy_set_header Connection "upgrade";
-    proxy_set_header Host $host;
-    proxy_read_timeout 3600s;
-}
-```
-
-On your laptop, edit `systemd/sdp-agent-micro.service` to dial through nginx on 80:
-
-```ini
-Environment=SDP_CP_URL=ws://172.18.139.186/ws/agent
-```
-
-(Port 80, no `:3452`.) Then on 186, reload nginx and re-do steps 7 and 8a.
-
 ### Login returns "git ls-remote rejected"
 
 Either: