deploy: sync backend to Space root (learn-lesson HF cache fix)

app/services/content_manifest.py

@@ -95,6 +95,11 @@ def _required_string(value: Any, label: str) -> str:
 
 @lru_cache(maxsize=1)
 def load_content_manifest() -> ContentManifest:
+    if not MANIFEST_PATH.is_file():
+        raise RuntimeError(
+            f"Content manifest is missing at {MANIFEST_PATH}. "
+            "Commit shared/content-manifest.json so CI and production can plan lessons."
+        )
     raw = json.loads(MANIFEST_PATH.read_text(encoding="utf-8"))
     if raw.get("schemaVersion") != 1:
         raise RuntimeError("Unsupported content manifest schema version.")

tests/test_content_manifest.py

@@ -0,0 +1,8 @@
+from app.services.content_manifest import MANIFEST_PATH, load_content_manifest
+
+
+def test_content_manifest_file_is_present_and_loadable() -> None:
+    assert MANIFEST_PATH.is_file(), MANIFEST_PATH
+    manifest = load_content_manifest()
+    assert manifest.chapter("phy-p1-c1") is not None
+    assert manifest.mission("phy-p1-c1", "M1") is not None