Expose disabled plugin settings in the app-server API (#44905)

## What changed

- Accept `disabledPluginIds` in `thread/settings/update` and `turn/start`. A supplied list replaces the saved selection; omission or `null` preserves it, and `[]` clears it.
- Return the selection in thread start, resume, and fork responses and `thread/settings/updated` notifications. Update generated schemas and client types.
- Restore disabled plugin IDs from the history retained at the requested fork boundary, preserving explicit overrides.

The selection persists across resume but does not yet filter plugin capabilities.

## Testing

Add coverage for replacing, preserving, and clearing selections without inference; turn-start notifications; resume; and fork boundaries across legacy and paginated history, with loaded and restarted parents. Add a core regression test for history restoration and explicit clearing.

GitOrigin-RevId: 654a8c2a0527228d422c0dd4919228447e2663db

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json

@@ -21105,6 +21105,14 @@
           "cwd": {
             "$ref": "#/definitions/v2/AbsolutePathBuf"
           },
+          "disabledPluginIds": {
+            "default": [],
+            "description": "Saved list of disabled plugin IDs. Does not yet filter plugin capabilities.",
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
           "instructionSources": {
             "default": [],
             "description": "Environment-native paths to instruction source files currently loaded for this thread.",
@@ -23353,6 +23361,14 @@
           "cwd": {
             "$ref": "#/definitions/v2/AbsolutePathBuf"
           },
+          "disabledPluginIds": {
+            "default": [],
+            "description": "Saved list of disabled plugin IDs. Does not yet filter plugin capabilities.",
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
           "instructionSources": {
             "default": [],
             "description": "Environment-native paths to instruction source files currently loaded for this thread.",
@@ -23832,6 +23848,14 @@
           "cwd": {
             "$ref": "#/definitions/v2/AbsolutePathBuf"
           },
+          "disabledPluginIds": {
+            "default": [],
+            "description": "Saved list of disabled plugin IDs. Does not yet filter plugin capabilities.",
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
           "effort": {
             "anyOf": [
               {
@@ -24105,6 +24129,14 @@
           "cwd": {
             "$ref": "#/definitions/v2/AbsolutePathBuf"
           },
+          "disabledPluginIds": {
+            "default": [],
+            "description": "Saved list of disabled plugin IDs. Does not yet filter plugin capabilities.",
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
           "instructionSources": {
             "default": [],
             "description": "Environment-native paths to instruction source files currently loaded for this thread.",
@@ -25135,6 +25167,16 @@
               "null"
             ]
           },
+          "disabledPluginIds": {
+            "description": "Replace this thread's disabled plugin IDs. Omitted/null preserves the list; [] clears it.",
+            "items": {
+              "type": "string"
+            },
+            "type": [
+              "array",
+              "null"
+            ]
+          },
           "effort": {
             "anyOf": [
               {