feat: add codex review failover and suppress output hardening

src/output-suppression.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from 'vitest';
+
+import { classifySuppressTokenOutput } from './output-suppression.js';
+
+describe('classifySuppressTokenOutput', () => {
+  it('treats the current turn suppress token as exact', () => {
+    expect(
+      classifySuppressTokenOutput(
+        '__EJ_SUPPRESS_deadbeefdeadbeefdeadbeef__',
+        '__EJ_SUPPRESS_deadbeefdeadbeefdeadbeef__',
+      ),
+    ).toBe('exact');
+  });
+
+  it('treats a leaked foreign suppress token as exact silent output', () => {
+    expect(
+      classifySuppressTokenOutput(
+        '__EJ_SUPPRESS_feedfacefeedfacefeedface__',
+        '__EJ_SUPPRESS_deadbeefdeadbeefdeadbeef__',
+      ),
+    ).toBe('exact');
+  });
+
+  it('treats a malformed foreign suppress token without the closing suffix as exact silent output', () => {
+    expect(
+      classifySuppressTokenOutput(
+        '__EJ_SUPPRESS_feedfacefeedfacefeedface',
+        '__EJ_SUPPRESS_deadbeefdeadbeefdeadbeef__',
+      ),
+    ).toBe('exact');
+  });
+
+  it('treats a suppress token embedded in visible text as mixed', () => {
+    expect(
+      classifySuppressTokenOutput(
+        'prefix __EJ_SUPPRESS_feedfacefeedfacefeedface__ suffix',
+        '__EJ_SUPPRESS_deadbeefdeadbeefdeadbeef__',
+      ),
+    ).toBe('mixed');
+  });
+});