Add varied messaging experiments

tests/openrouter-client.test.ts

@@ -470,7 +470,31 @@ describe('OpenRouterClient', () => {
       expect(prompt).toContain('Example 1:');
       expect(prompt).toContain('Example 2:');
       expect(prompt).toContain('Hey you look great');
-      expect(prompt).toContain('positive responses');
+      expect(prompt).toContain('PERFORMANCE EXAMPLES');
+      expect(prompt).toContain('do not copy their opening words');
+    });
+
+    it('includes recent messages as anti-repetition context', async () => {
+      mockCreate.mockResolvedValueOnce({
+        choices: [{ message: { content: 'A different shape' } }],
+      });
+
+      await client.generateMessage(
+        'Analysis',
+        'Title',
+        'Author',
+        [],
+        undefined,
+        null,
+        null,
+        undefined,
+        ['Damn, you look amazing. Got any more pics?'],
+      );
+
+      const prompt = mockCreate.mock.calls[0][0].messages[0].content as string;
+      expect(prompt).toContain('RECENT MESSAGES TO AVOID IMITATING');
+      expect(prompt).toContain('Damn, you look amazing');
+      expect(prompt).toContain('different opening words');
     });
 
     it('substitutes {rating} placeholder when score provided', async () => {