Merge branch 'test-coverage'

Add test utilities and ast-grep rules for code quality.

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

packages/server-utils/src/hash-password.ts

@@ -63,7 +63,7 @@ export const hashPassword = async (password: string): Promise<string> => {
   const saltB64 = toBase64(salt.buffer);
   const hashB64 = toBase64(derivedBits);
 
-  return `$${ALGORITHM}$${String(ITERATIONS)}$${saltB64}$${hashB64}`;
+  return `$${ALGORITHM}$${ITERATIONS.toString()}$${saltB64}$${hashB64}`;
 };
 
 export const verifyPassword = async (