refactor(ansible): rename freecad_mcp env vars and rework deployment

- Drop `FREECAD_MCP_` prefix from env vars (use `FREECAD_*`)
- Update freecad_mcp port from 22032 to 22061
- Document that FreeCAD bridge is required for tool calls
- Replace kottos deployment with pallas deployment

ansible/kottos/agents.yaml.j2

@@ -1,43 +1,62 @@
-# Kottos — Deployment Configuration (rendered by Ansible)
-# ------------------------------------------------------------------
-# Single source of truth for agent topology, ports, and registry
-# metadata.  Read by Pallas at startup.  The kottos/agents.yaml
-# committed in the kottos repo is the local-dev equivalent; Ansible
-# overwrites it with this rendered version.
-#
-# Host + namespace + registry port come from inventory host_vars so
-# Ouranos / Virgo / Taurus each get their own shape without template
-# edits.
+# Kottos — Deployment Configuration
+# Single source of truth for agent topology, ports, and registry metadata.
+# Read by Pallas at startup.
 
 name: kottos
 version: "1.0.0"
-host: {{ kottos_agents_host | default(kottos_host) | default(inventory_hostname) }}
-namespace: {{ kottos_namespace | default('ca.helu.kottos') }}
-registry_port: {{ kottos_registry_port | default(24100) }}
+host: {{ kottos_bind_host | default(inventory_hostname) }}
+namespace: ca.helu.kottos
+registry_port: {{ kottos_registry_port }}
 
 agents:
   harper:
     module: agents.harper
-    port: {{ kottos_harper_port | default(24101) }}
+    port: 24101
     title: Harper
     description: "Scrappy engineer — rapid prototyping, hacking, and creative problem-solving"
     depends_on: [research, tech_research]
+{% if kottos_harper_model is defined %}
+    model: {{ kottos_harper_model }}
+{% endif %}
 
   scotty:
     module: agents.scotty
-    port: {{ kottos_scotty_port | default(24102) }}
+    port: 24102
     title: Scotty
     description: "Systems administration expert — infrastructure diagnostics, security hardening, and keeping everything running"
     depends_on: [tech_research]
+{% if kottos_scotty_model is defined %}
+    model: {{ kottos_scotty_model }}
+{% endif %}
 
   research:
     module: agents.research
-    port: {{ kottos_research_port | default(24150) }}
+    port: 24150
     title: Research Agent
     description: "Web search via Argos and knowledge graph via Neo4j"
+{% if kottos_research_model is defined %}
+    model: {{ kottos_research_model }}
+    model_capabilities:
+      vision: {{ kottos_research_model_vision | default(true) }}
+      context_window: {{ kottos_research_model_context_window | default(16384) }}
+      max_output_tokens: {{ kottos_research_model_max_output_tokens | default(8192) }}
+{% endif %}
 
   tech_research:
     module: agents.tech_research
-    port: {{ kottos_tech_research_port | default(24151) }}
+    port: 24151
     title: Tech Research
     description: "Technical investigation — library comparisons, API docs, framework patterns, code examples"
+{% if kottos_tech_research_model is defined %}
+    model: {{ kottos_tech_research_model }}
+{% endif %}
+
+  case:
+    module: agents.case
+    port: 24152
+    title: CASE
+    description: "Field systems agent — SD card imaging, LAN scanning, and storage operations on korax.helu.ca"
+    depends_on: []
+{% if kottos_case_model is defined %}
+    model: {{ kottos_case_model }}
+{% endif %}