Read the model-space annotation scale from the standard CANNOSCALE /
CANNOSCALEVALUE header variables instead of a user-variable hack, and
populate both the status-bar scale picker and the viewport Scale
property purely from the drawing's ACAD_SCALELIST — no built-in
fallback set. Xref-derived scales (`_XREF` suffix, `name|` prefix)
are filtered out so only the host drawing's own scales appear.
Bumps the patched acadrust to the commit that adds CANNOSCALE/
CANNOSCALEVALUE read/write.
Co-Authored-By: Claude Opus 4.8 <[email protected]>