docs(signal-cli): document K8s networking limitation and current astro-orbiter production setup

- Production gateway on astro-orbiter VM working correctly
- K8s deployment ready but cannot complete Signal registration
- Signal servers reject WebSocket connections from K8s cluster network path
- Document migration procedure for when astro-orbiter is decommissioned

cluster/applications/signal-cli/DEPLOYMENT.md

@@ -101,11 +101,33 @@ Files were moved from `cluster/platform/connections/` to `cluster/applications/s
 - ✅ application.yaml (updated source path)
 - ✅ ingress.yaml (newly created)
 
+## Current Status
+
+**Production Gateway**: astro-orbiter VM (10.1.71.130:8080)
+- signal-cli 0.14.3 native daemon mode with HTTP JSON-RPC API
+- Account +126****8840 registered and operational
+- Hermes connected via SIGNAL_HTTP_URL=http://10.1.71.130:8080
+
+**K8s Deployment Status**:
+- ✅ Infrastructure deployed and ready (ingress, PVC, service)
+- ✅ Native signal-cli daemon running in multi-account mode
+- ✅ Ingress accessible at https://connections.local.mk-labs.cloud
+- ❌ Cannot complete Signal registration from K8s network path
+  - Linking fails with "Connection closed unexpectedly" during WebSocket handshake
+  - Signal servers reject connections from K8s cluster (HTTP 499, same on all nodes)
+  - Issue persists with hostNetwork=true
+  - Likely NAT/firewall/IP reputation blocking Signal WebSocket connections
+
+**When Migrating from Astro-Orbiter**:
+1. Link account from a non-K8s VM (e.g., carousel-of-progress)
+2. Copy working signal-cli data to K8s PVC
+3. Update Hermes: SIGNAL_HTTP_URL=https://connections.local.mk-labs.cloud
+4. Restart Hermes gateway
+
 ## Next Steps
 
-1. **DNS Configuration**: Ensure `connections.local.mk-labs.cloud` resolves to the nginx-ingress controller IP
+1. **Investigate K8s egress networking** - why Signal rejects WebSocket connections from cluster
-2. **Registration**: Register a Signal phone number via the REST API
+2. **Alternative**: Keep Signal gateway on dedicated VM outside K8s
-3. **Integration**: Configure Hermes to use this endpoint for Signal notifications
 
 ## Monitoring