Add commenter targeting mode

tests/config.test.ts

@@ -434,7 +434,7 @@ openrouter:
 
 const config = loadConfig();
     expect(config.reddit.subreddits).toEqual([{
-      name: 'test-sub', enabled: true, type: 'image', tone: 'default',
+      name: 'test-sub', enabled: true, type: 'image', targetingMode: 'post-author', tone: 'default',
       conversation: { mode: 'legacy', maxAutomatedTurns: 3, rapportTurnsBeforeMediaAsk: 3 },
     }]);
     expect(config.reddit.pollIntervalMs).toBe(5000);