Fix readFileRange Kotlin Int overflow in IntelliJ plugin

core/tools/implementations/readFileRange.integration.vitest.ts

@@ -76,15 +76,15 @@ test("readFileRangeImpl handles out-of-bounds ranges gracefully", async () => {
     "file:///test.txt",
     {
       start: { line: 99, character: 0 }, // 100 - 1
-      end: { line: 104, character: Number.MAX_SAFE_INTEGER }, // 105 - 1
+      end: { line: 104, character: 2147483647 }, // 105 - 1 (Int.MAX_VALUE for Kotlin compatibility)
     },
   );
 
   expect(mockIdePartialRange.readRangeInFile).toHaveBeenCalledWith(
     "file:///test.txt",
     {
       start: { line: 4, character: 0 }, // 5 - 1
-      end: { line: 99, character: Number.MAX_SAFE_INTEGER }, // 100 - 1
+      end: { line: 99, character: 2147483647 }, // 100 - 1 (Int.MAX_VALUE for Kotlin compatibility)
     },
   );
 });
@@ -199,6 +199,6 @@ test("readFileRangeImpl handles normal ranges correctly", async () => {
   // Verify correct 0-based conversion
   expect(mockIde.readRangeInFile).toHaveBeenCalledWith("file:///test.txt", {
     start: { line: 1, character: 0 }, // 2 - 1
-    end: { line: 3, character: Number.MAX_SAFE_INTEGER }, // 4 - 1
+    end: { line: 3, character: 2147483647 }, // 4 - 1 (Int.MAX_VALUE for Kotlin compatibility)
   });
 });

core/tools/implementations/readFileRange.ts

@@ -52,7 +52,7 @@ export const readFileRangeImpl: ToolImpl = async (args, extras) => {
     },
     end: {
       line: endLine - 1, // Convert from 1-based to 0-based
-      character: Number.MAX_SAFE_INTEGER, // Read to end of line
+      character: 2147483647, // Read to end of line (Int.MAX_VALUE for Kotlin compatibility)
     },
   });