Fix Space startup: sync full app source

tsfm_bench/data/ts_bench.py

@@ -3,7 +3,6 @@ from __future__ import annotations
 import csv
 import json
 import logging
-import os
 import subprocess
 import sys
 from dataclasses import dataclass
@@ -184,11 +183,10 @@ class TsBenchDataSource:
         if not manifest_path.exists():
             manifest_path = self.data_root / "model_inputs_latest" / "manifest.csv"
         if not manifest_path.exists():
-            logger.warning(
-                "No TS-Bench manifest under %s — call refresh() to collect data",
-                manifest_path.parent,
+            raise FileNotFoundError(
+                f"No TS-Bench manifest under {self.data_root / 'model_inputs_latest'}. "
+                "Run collect_weekly_data.py and export_model_inputs.py first."
             )
-            return tuple()
 
         entries: list[dict[str, Any]]
         if manifest_path.suffix == ".json":