fix: load all year shards into combined feed, not just top 2

bincio/render/merge.py

@@ -354,13 +354,9 @@ def write_combined_feed(data_dir: Path) -> int:
         activities = index.get("activities", [])
 
         if shards:
-            year_shards = sorted(
-                [s for s in shards if re.match(r"index-\d{4}\.json$", s.get("url", ""))],
-                key=lambda s: s["url"],
-                reverse=True,
-            )
+            year_shards = [s for s in shards if re.match(r"index-\d{4}\.json$", s.get("url", ""))]
             base = index_path.parent
-            for shard in year_shards[:2]:
+            for shard in year_shards:
                 shard_path = base / shard["url"]
                 if shard_path.exists():
                     shard_data = json.loads(shard_path.read_text(encoding="utf-8"))