Sketch on every side wall of one sketch extruded up and down (#957)

* Name a side drawn on several sketch curves by all of them

An extrude named each side wall after the one sketch curve its profile
segment lies on. A wall along two coincident lines (squares drawn edge to
edge) or along collinear lines merged into one profile segment had no
single curve, so it was named from geometry and could not carry a sketch
attachment. One sketch extruded up and down and joined (the logo) refused
a sketch on every one of its side walls.

Such a side is now named by every curve it lies on, in sketch order: the
first is its name, the others aliases. The set is fixed by the sketch, so
the name is exact. The refusal message no longer blames merged faces.

Adds the reported logo design and a synthetic up-and-down join to the
action-matrix designs, and a regression test that sketches and extrudes on
every flat face, fresh and after save and reopen.

Fixes #954

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Action matrix: record the up-and-down join designs

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/cmd/sketch_face.rs

@@ -192,7 +192,8 @@ fn capture_impl(s: &Session, value: &Value, cmd: &str, internal: bool) -> Result
         {
             return Err(bad(
                 cmd,
-                "this face can't keep an attachment: it was merged from more than one feature's faces or reshaped by an edit. \
+                "this face can't keep an attachment: its history can't tell it apart from other faces (an edit reshaped it, \
+                 or more than one face could claim its name). \
                  Pick another face, or use a fixed plane here (fixed:true), which won't follow later changes to the face",
             ));
         }