feat(collector): add support model name without /

Openrouter models use a vendor/model format. Other providers (e.g.
Cerebras) do not. In that case with default to `other/model_name`.

Author: S1M0N38

src/balatrollm/collector.py

@@ -16,10 +16,10 @@
 
 def _generate_run_dir(task: Task, base_dir: Path) -> Path:
     """Generate unique run directory path."""
-    assert re.match(r"^[a-z0-9.-]+/[a-z0-9:.-]+$", task.model), (
-        f"Invalid vendor/model format: {task.model}"
-    )
-    vendor, model = task.model.split("/", 1)
+    if "/" in task.model:
+        vendor, model = task.model.split("/", 1)
+    else:
+        vendor, model = "other", task.model
     dir_name = "_".join(
         [
             datetime.now().strftime("%Y%m%d_%H%M%S_%f")[:-3],
@@ -152,7 +152,10 @@ def __init__(self, task: Task, base_dir: Path) -> None:
         self._calls_total = 0
 
         # Write task with structured model for benchmark analysis
-        vendor, model_name = task.model.split("/", 1)
+        if "/" in task.model:
+            vendor, model_name = task.model.split("/", 1)
+        else:
+            vendor, model_name = "other", task.model
         task_data = {
             "model": {"vendor": vendor, "name": model_name},
             "seed": task.seed,