Write project.json to the storage owner prefix.

update_project used meta.user_id for the path, so JWT projects that still
have user_id=local never persisted pcb_status=queued and the PCB worker
exited as draft. Point writes at the prefix used to read the project.

backend/services/projects.py

@@ -201,10 +201,24 @@ def _read_meta_with_generation(
     return ProjectMeta.model_validate(data), gen
 
 
-def _write_meta(storage: StorageBackend, meta: ProjectMeta) -> None:
+def _write_meta(
+    storage: StorageBackend,
+    meta: ProjectMeta,
+    *,
+    owner_user_id: str | None = None,
+) -> None:
+    """Persist meta under ``users/{owner}/projects/{id}/``.
+
+    ``meta.user_id`` can lag the storage prefix (local-auth accounts that
+    still have ``user_id: "local"`` in JSON while files live under
+    ``users/usr_…/``). Writes must follow the prefix used to *read* the
+    project, not the stale field — otherwise ``update_project(pcb_status=…)``
+    lands in a different tree and the PCB worker still sees ``draft``.
+    """
+    uid = owner_user_id or meta.user_id
     meta.updated = datetime.now(timezone.utc).isoformat()
     storage.write_json(
-        _meta_key(meta.user_id, meta.id),
+        _meta_key(uid, meta.id),
         meta.model_dump(),
     )
 
@@ -516,7 +530,7 @@ def update_project(
     meta = _read_meta(storage, user_id, project_id)
     for k, v in fields.items():
         setattr(meta, k, v)
-    _write_meta(storage, meta)
+    _write_meta(storage, meta, owner_user_id=user_id)
     return meta
 
 
@@ -691,7 +705,7 @@ def add_collaborator(
     meta = _read_meta(storage, owner_user_id, project_id)
     if collaborator_user_id not in meta.collaborators:
         meta.collaborators.append(collaborator_user_id)
-        _write_meta(storage, meta)
+        _write_meta(storage, meta, owner_user_id=owner_user_id)
     # Write reverse reference for the collaborator
     ref_key = _shared_ref_key(collaborator_user_id, project_id)
     storage.write_json(ref_key, {"owner_user_id": owner_user_id})
@@ -704,7 +718,7 @@ def remove_collaborator(
     """Remove a collaborator from a project and delete the shared reference."""
     meta = _read_meta(storage, owner_user_id, project_id)
     meta.collaborators = [c for c in meta.collaborators if c != collaborator_user_id]
-    _write_meta(storage, meta)
+    _write_meta(storage, meta, owner_user_id=owner_user_id)
     # Delete reverse reference
     ref_key = _shared_ref_key(collaborator_user_id, project_id)
     if storage.exists(ref_key):