Fix issues that resulted in Gemini trying to use relative paths where absolute paths were required (#3938)

packages/core/src/tools/read-many-files.ts

@@ -390,7 +390,7 @@ Use this tool when the user's query implies needing the content of several files
         if (typeof fileReadResult.llmContent === 'string') {
           const separator = DEFAULT_OUTPUT_SEPARATOR_FORMAT.replace(
             '{filePath}',
-            relativePathForDisplay,
+            filePath,
           );
           contentParts.push(`${separator}\n\n${fileReadResult.llmContent}\n\n`);
         } else {