fix(tools): replace replaceAll with replace for ES2020 compatibility

Use regex replace instead of replaceAll to support older target versions.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/agent/tools/policy.ts

@@ -60,7 +60,7 @@ function compilePattern(pattern: string): CompiledPattern {
   const escaped = normalized.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
   return {
     kind: "regex",
-    value: new RegExp(`^${escaped.replaceAll("\\*", ".*")}$`),
+    value: new RegExp(`^${escaped.replace(/\\\*/g, ".*")}$`),
   };
 }