Fix cached GGUF model metadata in Cookbook Serve

tests/test_cookbook_helpers.py

@@ -1,7 +1,12 @@
+import json
+import subprocess
+import sys
+
 import pytest
 from fastapi import HTTPException
 
 from routes.cookbook_helpers import (
+    _cached_model_scan_script,
     _append_serve_exit_code_lines,
     _append_serve_preflight_exit_lines,
     _local_tooling_path_export,
@@ -92,3 +97,29 @@ def test_serve_runner_preserves_command_exit_code():
     assert "ODYSSEUS_CMD_EXIT=$?" in script
     assert 'echo "=== Process exited with code $ODYSSEUS_CMD_EXIT ==="' in script
     assert 'echo "=== Process exited with code $? ==="' not in script
+
+
+def test_cached_model_scan_reports_plain_dir_gguf(tmp_path):
+    """Custom download dirs may sit inside the HF hub cache and contain plain
+    per-model folders. They must show up in Serve and keep the GGUF signal."""
+    plain = tmp_path / "Qwen3.6-27B"
+    plain.mkdir()
+    (plain / "Qwen3.6-27B-Q4_K_M.gguf").write_bytes(b"gguf")
+
+    hf_internal = tmp_path / "models--Qwen--Qwen3.6-27B"
+    (hf_internal / "snapshots" / "abc").mkdir(parents=True)
+    (hf_internal / "snapshots" / "abc" / "model.safetensors").write_bytes(b"safe")
+
+    scan_py = tmp_path / "scan_cache.py"
+    scan_py.write_text(_cached_model_scan_script([str(tmp_path)]), encoding="utf-8")
+    proc = subprocess.run(
+        [sys.executable, str(scan_py)],
+        check=True,
+        capture_output=True,
+        text=True,
+    )
+
+    by_repo = {m["repo_id"]: m for m in json.loads(proc.stdout)}
+    assert "models--Qwen--Qwen3.6-27B" not in by_repo
+    assert by_repo["Qwen3.6-27B"]["is_local_dir"] is True
+    assert by_repo["Qwen3.6-27B"]["is_gguf"] is True