[Bug] hs_persist_state silently ignores unknown variable names #1
Description
Summary
Passing a name that does not correspond to any variable produces an empty state string with no warning or error.
Current behavior
- returns success with no output.
- Callers cannot distinguish a typo from an intentional omission.
Expected behavior
- Detect unknown variable names and fail with a clear error (or emit a warning).
Severity
Medium.
Notes
- This is currently covered by tests added for unknown names.