add pds-records flow for general-purpose PDS record management
- new flow parameterized by action (list/delete/create/update), collection, and filters
- uses pdsx for auth and operations instead of hand-rolled httpx
- validate connectionType in curate agent against allowed enum
- add pdsx dep to mps workspace package
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>