Add inline script environment persistence

Persist per-script inline environment associations, rehydrate them on demand, and validate ownership and current metadata before returning selections.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 22cdcbcc-09ff-41d0-9fcf-59a6a5117ff1

Author: StellaHuang95