app-server: Replay pending item requests on thread/resume

Replay pending client requests after `thread/resume` and emit resolved notifications when those requests clear so approval/input UI state stays in sync after reconnects and across subscribed clients.

Affected RPCs:
- `item/commandExecution/requestApproval`
- `item/fileChange/requestApproval`
- `item/tool/requestUserInput`
- `skill/requestApproval`

Motivation:
- Resumed clients need to see pending approval/input requests that were already outstanding before the reconnect.
- Clients also need an explicit signal when a pending request resolves or is cleared so stale UI can be removed on turn start, completion, or interruption.

Implementation notes:
- Track pending client requests in `ThreadState` and replay them after `thread/resume` attaches the connection.
- Reuse the original JSON-RPC request id for replays and resend prerequisite notifications like `item/started` for pending file change approvals.
- Emit `item/commandExecution/approvalResolved`, `item/fileChange/approvalResolved`, `item/tool/requestUserInputResolved`, and `skill/approvalResolved` when pending requests are answered or cleared by lifecycle cleanup.
- Update the app-server protocol schema, generated TypeScript bindings, and README docs for the replay/resolution flow.

High-level test plan:
- Added automated coverage for replaying pending command execution, file change, and skill approval requests on `thread/resume`.
- Added automated coverage for resolved notifications in command approval, file change approval, request_user_input, skill approval, turn start, and turn interrupt flows.
- Verified schema/docs updates in the relevant protocol and app-server tests.

Manual testing:
- Not run.

Author: euroelessar

codex-rs/app-server-protocol/schema/json/ServerNotification.json

@@ -653,6 +653,21 @@
         }
       ]
     },
+    "CommandExecutionApprovalResolvedNotification": {
+      "properties": {
+        "requestId": {
+          "$ref": "#/definitions/RequestId"
+        },
+        "threadId": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "requestId",
+        "threadId"
+      ],
+      "type": "object"
+    },
     "CommandExecutionOutputDeltaNotification": {
       "properties": {
         "delta": {
@@ -853,6 +868,21 @@
       ],
       "type": "object"
     },
+    "FileChangeApprovalResolvedNotification": {
+      "properties": {
+        "requestId": {
+          "$ref": "#/definitions/RequestId"
+        },
+        "threadId": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "requestId",
+        "threadId"
+      ],
+      "type": "object"
+    },
     "FileChangeOutputDeltaNotification": {
       "properties": {
         "delta": {
@@ -1422,6 +1452,17 @@
       ],
       "type": "object"
     },
+    "RequestId": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "format": "int64",
+          "type": "integer"
+        }
+      ]
+    },
     "SessionSource": {
       "oneOf": [
         {
@@ -1449,6 +1490,21 @@
         }
       ]
     },
+    "SkillRequestApprovalResolvedNotification": {
+      "properties": {
+        "requestId": {
+          "$ref": "#/definitions/RequestId"
+        },
+        "threadId": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "requestId",
+        "threadId"
+      ],
+      "type": "object"
+    },
     "SubAgentSource": {
       "oneOf": [
         {
@@ -2592,6 +2648,21 @@
       ],
       "type": "object"
     },
+    "ToolRequestUserInputResolvedNotification": {
+      "properties": {
+        "requestId": {
+          "$ref": "#/definitions/RequestId"
+        },
+        "threadId": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "requestId",
+        "threadId"
+      ],
+      "type": "object"
+    },
     "Turn": {
       "properties": {
         "error": {
@@ -3402,6 +3473,26 @@
       "title": "Item/commandExecution/terminalInteractionNotification",
       "type": "object"
     },
+    {
+      "properties": {
+        "method": {
+          "enum": [
+            "item/commandExecution/approvalResolved"
+          ],
+          "title": "Item/commandExecution/approvalResolvedNotificationMethod",
+          "type": "string"
+        },
+        "params": {
+          "$ref": "#/definitions/CommandExecutionApprovalResolvedNotification"
+        }
+      },
+      "required": [
+        "method",
+        "params"
+      ],
+      "title": "Item/commandExecution/approvalResolvedNotification",
+      "type": "object"
+    },
     {
       "properties": {
         "method": {
@@ -3422,6 +3513,66 @@
       "title": "Item/fileChange/outputDeltaNotification",
       "type": "object"
     },
+    {
+      "properties": {
+        "method": {
+          "enum": [
+            "item/fileChange/approvalResolved"
+          ],
+          "title": "Item/fileChange/approvalResolvedNotificationMethod",
+          "type": "string"
+        },
+        "params": {
+          "$ref": "#/definitions/FileChangeApprovalResolvedNotification"
+        }
+      },
+      "required": [
+        "method",
+        "params"
+      ],
+      "title": "Item/fileChange/approvalResolvedNotification",
+      "type": "object"
+    },
+    {
+      "properties": {
+        "method": {
+          "enum": [
+            "item/tool/requestUserInputResolved"
+          ],
+          "title": "Item/tool/requestUserInputResolvedNotificationMethod",
+          "type": "string"
+        },
+        "params": {
+          "$ref": "#/definitions/ToolRequestUserInputResolvedNotification"
+        }
+      },
+      "required": [
+        "method",
+        "params"
+      ],
+      "title": "Item/tool/requestUserInputResolvedNotification",
+      "type": "object"
+    },
+    {
+      "properties": {
+        "method": {
+          "enum": [
+            "skill/approvalResolved"
+          ],
+          "title": "Skill/approvalResolvedNotificationMethod",
+          "type": "string"
+        },
+        "params": {
+          "$ref": "#/definitions/SkillRequestApprovalResolvedNotification"
+        }
+      },
+      "required": [
+        "method",
+        "params"
+      ],
+      "title": "Skill/approvalResolvedNotification",
+      "type": "object"
+    },
     {
       "properties": {
         "method": {