When the file at json_path didn't exist, clicking Refresh Outputs
returned empty keys causing all outputs and links to be removed.
Now the API returns an error flag and the frontend bails out early,
preserving existing outputs.
Bump version to 1.2.1.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Auto-discovers JSON keys and exposes them as typed output slots.
Includes JS frontend for refresh, connection-safe updates, and
workflow persistence of keys and types.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
