Address type safety and correctness issues from PR #26 review

package.json

@@ -27,7 +27,7 @@
     "dotenv": "^16.4.5"
   },
   "devDependencies": {
-    "@types/node": "^22.10.5",
+    "@types/node": "^22.19.10",
     "typescript": "^5.7.2"
   }
 }

src/services/agent.ts

@@ -91,10 +91,11 @@ export class AutonomousAgent {
 
       console.log(`\n📬 [${new Date().toLocaleTimeString()}] Found ${newMentions.length} new mention(s)!\n`);
 
-      // Process each mention
-      for (const mention of newMentions) {
-        await this.processMention(mention);
-        this.processedMentions.add(mention.post.id);
+      // Process each mention in reverse (oldest first) to maintain chronological Set insertion order
+      // X API returns mentions newest-first, so we reverse to process oldest→newest
+      for (let i = newMentions.length - 1; i >= 0; i--) {
+        await this.processMention(newMentions[i]);
+        this.processedMentions.add(newMentions[i].post.id);
       }
 
       // Prune oldest entries to prevent unbounded memory growth

src/services/xapi.ts

@@ -91,6 +91,11 @@ export class XAPIClient {
         return null;
       }
 
+      if (!Array.isArray(response.data)) {
+        console.warn('Unexpected response shape from X API (thread): data is not an array');
+        return null;
+      }
+
       return this.parseThread(response.data);
     } catch (error) {
       console.error('Error fetching thread:', error);