Sketch on cut walls, chamfers, pattern copies, join-merged sides and split faces (#625)

A flat face that no construction certificate names on its own now attaches by its exact history name (a new lineage face certificate): cut walls and floors, chamfer faces, each pattern or mirror copy, side walls a Join merged, and the pieces a later feature split a face into. Construction certificates still come first; a seed keeps its certificate when it is patterned. Two flush extrudes of one outline joined end to end keep their exact history in the prism boolean. Face sketch 52% -> 71%, offset plane 52% -> 71%, press-pull/extrude from face 41% -> 60% in the action matrix; baseline blessed.

Fixes #491, fixes #492, fixes #493, fixes #557.

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

crates/doc/src/format.rs

@@ -66,6 +66,10 @@
 //!   A design can also keep what was hidden when it was saved (`visibility`: hidden bodies,
 //!   occurrence placements, sketches and origin items; `browser.visibility`). A design without
 //!   it shows everything, as it always did; a reader that ignores it loses only the hiding.
+//!   Sketch face anchors can name a flat face by its exact history name (a `lineage`
+//!   certificate: the target's `name`, e.g. a cut wall `F5:side:l1` or a pattern copy
+//!   `F4:top@F6.2`), where no construction certificate names it alone. Anchors with
+//!   construction certificates resolve as before.
 
 use serde_json::Value;