Add migrate external config to codex TUI support

codex-rs/core/config.schema.json

@@ -621,6 +621,25 @@
       },
       "type": "object"
     },
+    "ExternalConfigMigrationPrompts": {
+      "additionalProperties": false,
+      "description": "Settings for notices we display to users via the tui and app-server clients (primarily the Codex IDE extension). NOTE: these are different from notifications - notices are warnings, NUX screens, acknowledgements, etc.",
+      "properties": {
+        "home": {
+          "description": "Tracks whether home-level external config migration prompts are hidden.",
+          "type": "boolean"
+        },
+        "projects": {
+          "additionalProperties": {
+            "type": "boolean"
+          },
+          "default": {},
+          "description": "Tracks which project paths have opted out of external config migration prompts.",
+          "type": "object"
+        }
+      },
+      "type": "object"
+    },
     "FeatureToml_for_MultiAgentV2ConfigToml": {
       "anyOf": [
         {
@@ -1122,8 +1141,20 @@
       "type": "object"
     },
     "Notice": {
-      "description": "Settings for notices we display to users via the tui and app-server clients (primarily the Codex IDE extension). NOTE: these are different from notifications - notices are warnings, NUX screens, acknowledgements, etc.",
+      "additionalProperties": false,
       "properties": {
+        "external_config_migration_prompts": {
+          "allOf": [
+            {
+              "$ref": "#/definitions/ExternalConfigMigrationPrompts"
+            }
+          ],
+          "default": {
+            "home": null,
+            "projects": {}
+          },
+          "description": "Tracks scopes where external config migration prompts should be suppressed."
+        },
         "hide_full_access_warning": {
           "description": "Tracks whether the user has acknowledged the full access warning prompt.",
           "type": "boolean"