feat(core): remove spawn_mode from agent roles

codex-rs/core/config.schema.json

@@ -6,13 +6,6 @@
       "description": "A path that is guaranteed to be absolute and normalized (though it is not guaranteed to be canonicalized or exist on the filesystem).\n\nIMPORTANT: When deserializing an `AbsolutePathBuf`, a base path must be set using [AbsolutePathBufGuard::new]. If no base path is set, the deserialization will fail unless the path being deserialized is already absolute.",
       "type": "string"
     },
-    "AgentRoleSpawnMode": {
-      "enum": [
-        "spawn",
-        "fork"
-      ],
-      "type": "string"
-    },
     "AgentRoleToml": {
       "additionalProperties": false,
       "properties": {
@@ -43,14 +36,6 @@
           },
           "type": "array"
         },
-        "spawn_mode": {
-          "allOf": [
-            {
-              "$ref": "#/definitions/AgentRoleSpawnMode"
-            }
-          ],
-          "description": "Optional default spawn mode when `spawn_agent` omits `spawn_mode`."
-        },
         "watchdog_interval_s": {
           "description": "Optional watchdog interval in seconds for roles that should behave as watchdogs.",
           "format": "int64",
@@ -2719,4 +2704,4 @@
   },
   "title": "ConfigToml",
   "type": "object"
-}
+}