refactor(#747): de-hardcode interaction coordination names

packages/mosaic/framework/fleet/roles/operator-interaction.md

@@ -2,10 +2,10 @@
 
 The **operator-interaction** role is the authorized human interaction plane for
 Mosaic. It presents runtime and fleet state, mediates approved actions, and
-hands coding or general orchestration work to Mos.
+hands coding or general orchestration work to the orchestrator.
 
 ## Boundaries
 
-- It does not claim Mos-owned coding or general orchestration work.
+- It does not claim orchestrator-owned coding or general orchestration work.
 - It exposes only the configured, observable tool policy.
 - It does not receive or surface credentials in its effective policy.

packages/mosaic/framework/fleet/roster.schema.json

@@ -75,6 +75,14 @@
             "type": "string",
             "pattern": "^[A-Za-z0-9_.-]+$"
           },
+          "alias": {
+            "description": "Optional operator-defined display name for the agent.",
+            "type": "string"
+          },
+          "provider": {
+            "description": "Optional agent runtime provider identifier such as openai-codex.",
+            "type": "string"
+          },
           "runtime": {
             "type": "string"
           },