MLEADER's Options answered "not available yet" for Leader type sPline and
None and for Content type Block. Spline leaders now draw as smooth curves
through their points (DXF LEADER path type 72 = 1); None places only the
content at one picked point; Block asks for a block name and how it
attaches (Center extents or Insertion point) and inserts it at the end of
the landing. MLeader gains `spline` and `block` (serde defaults); DXF stays
LEADER + MTEXT/INSERT. PURGE, RENAME, copy/paste, FLATTEN, grips and
extents follow the block content. The choices are remembered like the
other MLEADER options. docs/gaps.md: top-10 row 5, F1 and F10 narrowed.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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