🤖 Remove decimal precision from file sizes to preserve tokens

Change formatSize() to use Math.round() instead of toFixed(1):
- Before: 1.5KB, 2.3MB
- After: 2KB, 2MB

No decimals in file sizes preserves tokens in LLM output without
sacrificing meaningful precision for directory listings. Tests still
pass as they use regex patterns matching both formats.

Author: ammar-agent

src/services/tools/file_list.ts

@@ -54,11 +54,12 @@ function formatTreeAsString(entries: FileEntry[], indent = "", isLast: boolean[]
 
 /**
  * Format a file size in bytes to a human-readable string
+ * No decimals to preserve tokens in LLM output
  */
 function formatSize(bytes: number): string {
   if (bytes < 1024) return `${bytes}B`;
-  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)}KB`;
-  return `${(bytes / (1024 * 1024)).toFixed(1)}MB`;
+  if (bytes < 1024 * 1024) return `${Math.round(bytes / 1024)}KB`;
+  return `${Math.round(bytes / (1024 * 1024))}MB`;
 }
 
 /**