[codex] Add symlink flag to fs metadata (#17719)

Add `is_symlink` to FsMetadata struct.

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

@@ -7713,11 +7713,15 @@
             "type": "integer"
           },
           "isDirectory": {
-            "description": "Whether the path currently resolves to a directory.",
+            "description": "Whether the path resolves to a directory.",
             "type": "boolean"
           },
           "isFile": {
-            "description": "Whether the path currently resolves to a regular file.",
+            "description": "Whether the path resolves to a regular file.",
+            "type": "boolean"
+          },
+          "isSymlink": {
+            "description": "Whether the path itself is a symbolic link.",
             "type": "boolean"
           },
           "modifiedAtMs": {
@@ -7730,6 +7734,7 @@
           "createdAtMs",
           "isDirectory",
           "isFile",
+          "isSymlink",
           "modifiedAtMs"
         ],
         "title": "FsGetMetadataResponse",

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

@@ -4354,11 +4354,15 @@
           "type": "integer"
         },
         "isDirectory": {
-          "description": "Whether the path currently resolves to a directory.",
+          "description": "Whether the path resolves to a directory.",
           "type": "boolean"
         },
         "isFile": {
-          "description": "Whether the path currently resolves to a regular file.",
+          "description": "Whether the path resolves to a regular file.",
+          "type": "boolean"
+        },
+        "isSymlink": {
+          "description": "Whether the path itself is a symbolic link.",
           "type": "boolean"
         },
         "modifiedAtMs": {
@@ -4371,6 +4375,7 @@
         "createdAtMs",
         "isDirectory",
         "isFile",
+        "isSymlink",
         "modifiedAtMs"
       ],
       "title": "FsGetMetadataResponse",

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

@@ -8,11 +8,15 @@
       "type": "integer"
     },
     "isDirectory": {
-      "description": "Whether the path currently resolves to a directory.",
+      "description": "Whether the path resolves to a directory.",
       "type": "boolean"
     },
     "isFile": {
-      "description": "Whether the path currently resolves to a regular file.",
+      "description": "Whether the path resolves to a regular file.",
+      "type": "boolean"
+    },
+    "isSymlink": {
+      "description": "Whether the path itself is a symbolic link.",
       "type": "boolean"
     },
     "modifiedAtMs": {
@@ -25,6 +29,7 @@
     "createdAtMs",
     "isDirectory",
     "isFile",
+    "isSymlink",
     "modifiedAtMs"
   ],
   "title": "FsGetMetadataResponse",

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

@@ -7,13 +7,17 @@
  */
 export type FsGetMetadataResponse = {
 /**
- * Whether the path currently resolves to a directory.
+ * Whether the path resolves to a directory.
  */
 isDirectory: boolean,
 /**
- * Whether the path currently resolves to a regular file.
+ * Whether the path resolves to a regular file.
  */
 isFile: boolean,
+/**
+ * Whether the path itself is a symbolic link.
+ */
+isSymlink: boolean,
 /**
  * File creation time in Unix milliseconds when available, otherwise `0`.
  */