Expose instruction sources (AGENTS.md) via app server (#17506)

Addresses #17498

Problem: The TUI derived /status instruction source paths from the local
client environment, which could show stale <none> output or incorrect
paths when connected to a remote app server.

Solution: Add an app-server v2 instructionSources snapshot to thread
start/resume/fork responses, default it to an empty list when older
servers omit it, and render TUI /status from that server-provided
session data.

Additional context: The app-server field is intentionally named
instructionSources rather than AGENTS.md-specific terminology because
the loaded instruction sources can include global instructions, project
AGENTS.md files, AGENTS.override.md, user-defined instruction files, and
future dynamic sources.

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

@@ -12806,6 +12806,14 @@
           "cwd": {
             "type": "string"
           },
+          "instructionSources": {
+            "default": [],
+            "description": "Instruction source files currently loaded for this thread.",
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
           "model": {
             "type": "string"
           },
@@ -14095,6 +14103,14 @@
           "cwd": {
             "type": "string"
           },
+          "instructionSources": {
+            "default": [],
+            "description": "Instruction source files currently loaded for this thread.",
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
           "model": {
             "type": "string"
           },
@@ -14386,6 +14402,14 @@
           "cwd": {
             "type": "string"
           },
+          "instructionSources": {
+            "default": [],
+            "description": "Instruction source files currently loaded for this thread.",
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
           "model": {
             "type": "string"
           },

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json

@@ -10654,6 +10654,14 @@
         "cwd": {
           "type": "string"
         },
+        "instructionSources": {
+          "default": [],
+          "description": "Instruction source files currently loaded for this thread.",
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
         "model": {
           "type": "string"
         },
@@ -11943,6 +11951,14 @@
         "cwd": {
           "type": "string"
         },
+        "instructionSources": {
+          "default": [],
+          "description": "Instruction source files currently loaded for this thread.",
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
         "model": {
           "type": "string"
         },
@@ -12234,6 +12250,14 @@
         "cwd": {
           "type": "string"
         },
+        "instructionSources": {
+          "default": [],
+          "description": "Instruction source files currently loaded for this thread.",
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
         "model": {
           "type": "string"
         },

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

@@ -2187,6 +2187,14 @@
     "cwd": {
       "type": "string"
     },
+    "instructionSources": {
+      "default": [],
+      "description": "Instruction source files currently loaded for this thread.",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
     "model": {
       "type": "string"
     },

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

@@ -2187,6 +2187,14 @@
     "cwd": {
       "type": "string"
     },
+    "instructionSources": {
+      "default": [],
+      "description": "Instruction source files currently loaded for this thread.",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
     "model": {
       "type": "string"
     },

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

@@ -2187,6 +2187,14 @@
     "cwd": {
       "type": "string"
     },
+    "instructionSources": {
+      "default": [],
+      "description": "Instruction source files currently loaded for this thread.",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
     "model": {
       "type": "string"
     },

codex-rs/app-server-protocol/schema/typescript/v2/ThreadForkResponse.ts

@@ -8,7 +8,11 @@ import type { AskForApproval } from "./AskForApproval";
 import type { SandboxPolicy } from "./SandboxPolicy";
 import type { Thread } from "./Thread";
 
-export type ThreadForkResponse = { thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: string, approvalPolicy: AskForApproval,
+export type ThreadForkResponse = { thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: string,
+/**
+ * Instruction source files currently loaded for this thread.
+ */
+instructionSources: Array<string>, approvalPolicy: AskForApproval,
 /**
  * Reviewer currently used for approval requests on this thread.
  */

codex-rs/app-server-protocol/schema/typescript/v2/ThreadResumeResponse.ts

@@ -8,7 +8,11 @@ import type { AskForApproval } from "./AskForApproval";
 import type { SandboxPolicy } from "./SandboxPolicy";
 import type { Thread } from "./Thread";
 
-export type ThreadResumeResponse = { thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: string, approvalPolicy: AskForApproval,
+export type ThreadResumeResponse = { thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: string,
+/**
+ * Instruction source files currently loaded for this thread.
+ */
+instructionSources: Array<string>, approvalPolicy: AskForApproval,
 /**
  * Reviewer currently used for approval requests on this thread.
  */

codex-rs/app-server-protocol/schema/typescript/v2/ThreadStartResponse.ts

@@ -8,7 +8,11 @@ import type { AskForApproval } from "./AskForApproval";
 import type { SandboxPolicy } from "./SandboxPolicy";
 import type { Thread } from "./Thread";
 
-export type ThreadStartResponse = { thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: string, approvalPolicy: AskForApproval,
+export type ThreadStartResponse = { thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: string,
+/**
+ * Instruction source files currently loaded for this thread.
+ */
+instructionSources: Array<string>, approvalPolicy: AskForApproval,
 /**
  * Reviewer currently used for approval requests on this thread.
  */