fix: update FreeCAD MCP URL and ports for consistency and add new backend configurations in Titania

docs/freecad_mcp.md

@@ -690,6 +690,40 @@ See [docs/COMPARISON.md](docs/COMPARISON.md) for a detailed analysis of these im
 
 ---
 
+## Ouranos Deployment
+
+The FreeCAD Robust MCP Server runs on `caliban.incus` and is exposed via Titania's HAProxy with TLS termination.
+
+### Architecture
+
+```
+External Agent (e.g., Claude Desktop / MCP Switchboard)
+        │  MCP Protocol (Streamable HTTP, TLS)
+        │  https://freecad-mcp.ouranos.helu.ca/mcp
+        ▼
+  Titania HAProxy (TLS termination, wildcard cert)
+        │  http://caliban.incus:22032/mcp
+        ▼
+  FreeCAD Robust MCP Server (HTTP transport mode)
+        │  XML-RPC (localhost:9875)
+        ▼
+  FreeCAD (GUI or headless)
+```
+
+### Integration
+
+The MCP URL is registered in `group_vars/all/vars.yml`:
+
+```yaml
+freecad_mcp_url: https://freecad-mcp.ouranos.helu.ca/mcp
+```
+
+The route is served via Titania's HAProxy using the existing `*.ouranos.helu.ca` Let's Encrypt wildcard certificate.
+
+**To deploy:** `ansible-playbook ansible/haproxy/configure.yml`
+
+---
+
 ## License
 
 MIT License - see [LICENSE](LICENSE) for details.