fix(grid-agent): move setup into YAML preferences (#135)

config/grid-agent.integrated.example.yml

@@ -0,0 +1,15 @@
+schema_version: 1
+integrated: true
+split: false
+llm:
+  endpoint_url: https://llm.example.invalid/v1/chat/completions
+  api_key: <replace-in-private-config>
+  model: <endpoint-model-name>
+grid:
+  login_url: https://grid.example.invalid/login
+  avatar_name: Service Avatar
+  password: <replace-in-private-config>
+# These UUIDs are the only users allowed to request privileged mutations.
+authorized_avatar_uuids:
+  - 00000000-0000-4000-8000-000000000001
+storage_path: data/grid-agent