Fix one-off mode to use pull_statuses

truthbrush doesn't have pull_status method, so fetch user's
statuses and search for the matching post ID instead.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/poller.py

@@ -96,13 +96,17 @@ def fetch_and_relay_post(post_url: str) -> bool:
 
     try:
         api = Api()
-        # Fetch the specific post
-        post = api.pull_status(post_id)
-        if post:
-            return process_single_post(post, username)
-        else:
-            print(f"Post not found: {post_id}", file=sys.stderr)
-            return False
+        # Fetch user's statuses and find the matching post
+        print(f"Fetching statuses for @{username} to find post {post_id}...")
+        statuses = list(api.pull_statuses(username, replies=True))
+
+        for post in statuses:
+            if str(post.get("id", "")) == post_id:
+                print(f"Found post {post_id}")
+                return process_single_post(post, username)
+
+        print(f"Post not found in recent statuses: {post_id}", file=sys.stderr)
+        return False
     except Exception as e:
         print(f"Error fetching post: {e}", file=sys.stderr)
         return False