fix(hooks): treat all non-zero exit codes except 1 as blocking

integration-tests/hooks-system.test.ts

@@ -102,7 +102,7 @@ describe('Hooks System Integration', () => {
         'stderr_block_hook.cjs',
         `
 process.stderr.write('File writing blocked by security policy');
-process.exit(101);
+process.exit(2);
 `,
       );
 

packages/core/src/hooks/hookRunner.ts

@@ -460,18 +460,18 @@ export class HookRunner {
         decision: 'allow',
         systemMessage: text,
       };
-    } else if (exitCode === EXIT_CODE_BLOCKING_ERROR) {
-      // Blocking error
-      return {
-        decision: 'deny',
-        reason: text,
-      };
-    } else {
-      // Non-blocking error (EXIT_CODE_NON_BLOCKING_ERROR or any other code)
+    } else if (exitCode === EXIT_CODE_NON_BLOCKING_ERROR) {
+      // Non-blocking error (EXIT_CODE_NON_BLOCKING_ERROR = 1)
       return {
         decision: 'allow',
         systemMessage: `Warning: ${text}`,
       };
+    } else {
+      // All other non-zero exit codes (including 2) are blocking
+      return {
+        decision: 'deny',
+        reason: text,
+      };
     }
   }
 }