Revert "Merge branch 'rhan/approval-source' into rhan/escalations-approvals-sandbox"

This reverts commit 2ad79b06f0, reversing
changes made to 7a2c92bf89.

codex-rs/app-server-protocol/schema/json/v2/RawResponseItemCompletedNotification.json

@@ -1,15 +1,6 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "definitions": {
-    "ApprovalSourceMetadata": {
-      "enum": [
-        "guardian",
-        "user",
-        "policy",
-        "unknown"
-      ],
-      "type": "string"
-    },
     "ContentItem": {
       "oneOf": [
         {
@@ -881,16 +872,6 @@
     },
     "ResponseItemMetadata": {
       "properties": {
-        "approval_source": {
-          "anyOf": [
-            {
-              "$ref": "#/definitions/ApprovalSourceMetadata"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
         "is_tool_call_escalated": {
           "type": [
             "boolean",