Fix xcodemake argument corruption from overly broad string replacement

The executeXcodemakeCommand function was using .replace() to remove project
directory paths from arguments, which would corrupt any argument containing
the project directory path as a substring (not just as a prefix).

Changed to use .startsWith() and .substring() to only remove the project
directory when it appears as a path prefix, matching the approach already
used in doesMakeLogFileExist.

Fixes XCODEBUILD-MCP-12S9

Author: cursoragent

CHANGELOG.md

@@ -14,6 +14,7 @@
 ### Fixed
 - Update UI automation guard guidance to point at `debug_continue` when paused.
 - Fix tool loading bugs in static tool registration.
+- Fix xcodemake command argument corruption when project directory path appears as substring in non-path arguments.
 
 ## [1.16.0] - 2025-12-30
 - Remove dynamic tool discovery (`discover_tools`) and `XCODEBUILDMCP_DYNAMIC_TOOLS`. Use `XCODEBUILDMCP_ENABLED_WORKFLOWS` to limit startup tool registration.

src/utils/xcodemake.ts

@@ -210,8 +210,14 @@ export async function executeXcodemakeCommand(
 
   const xcodemakeCommand = [getXcodemakeCommand(), ...buildArgs];
 
-  // Remove projectDir from arguments
-  const command = xcodemakeCommand.map((arg) => arg.replace(projectDir + '/', ''));
+  // Remove projectDir from arguments if present at the start
+  const prefix = projectDir + '/';
+  const command = xcodemakeCommand.map((arg) => {
+    if (arg.startsWith(prefix)) {
+      return arg.substring(prefix.length);
+    }
+    return arg;
+  });
 
   return getDefaultCommandExecutor()(command, logPrefix);
 }