Sheet metal rims and holes, plastic features, lofts, raised pieces and merged walls take face attachments (#677)

Sheet metal rims and bend ends attach by name (<panel>:rim.<edge>, <flange>:rim.bend0/1), as do face profiles from sheet faces. A plain or counterbored Hole square to a panel is machined into the flat pattern. Boss, Lip, Rest and Snap Fit keep the body's history and name their own faces. Hole tools name their faces by the part they cut, and pattern copies as copies. A pattern's repeated fillets keep the body's history. Loft sides are named by their section curves. A piece Offset Face moved off its face's plane attaches by its own qualified name. Sides of a profile grown to overlap a flush body keep their sketch line's name, so walls a Join merged take a sketch (#681). Face sketch 75% -> 90%, offset plane 75% -> 90%, press-pull/extrude 64% -> 85% in the action matrix; baseline blessed.

Fixes #494, fixes #495, fixes #560, fixes #561, fixes #563, fixes #564, fixes #681.

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

crates/engine/src/cmd/sketch_face.rs

@@ -105,10 +105,10 @@ fn capture_impl(s: &Session, value: &Value, cmd: &str, internal: bool) -> Result
             let inverse = mat_inverse(&frame).ok_or_else(|| bad(cmd, "invalid selected face frame"))?;
             let local_point = apply_point(&inverse, point);
             let tolerance = (body.body.size() * 1e-4).max(1e-5);
-            // A flat face of a sheet metal body attaches to its panel: the exact plane comes from
-            // the panel's flat region and fold, and the sketch keeps the face's name to follow it.
+            // A flat face of a sheet metal body attaches to its panel (or a panel's rim): the
+            // exact plane comes from the panel's flat region and fold, and the sketch keeps the
+            // face's name to follow it.
             if !fixed
-                && !internal
                 && let Some(sheet) = state.sheets.iter().find(|sheet| sheet.body == body.name)
                 && let Some((face, plane)) = sheet.panel_face_at(local_point, tolerance * 10.0)
             {