A point modifier typed at any point prompt pushes a frame on the session
(Session::point_mods) that asks for what it needs ("Base point:",
"<Offset>:", "First point of mid:", ".X of", "(need YZ):") and hands one
point to the command, so every command gets them from the command line
and in scripts, and they nest (FROM then M2P). `*x,y`, `*@` and `@*`
parse as world coordinates (the same as the plain forms: no UCS yet).
`<a` locks the next point to that angle from the base point: a typed
distance follows it, a pick is projected onto it, typed coordinates win.
TK is left to object snap tracking (#379).
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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