corpus: the filleted bracket partitioned into 30 blocks, meshed all-hex

filleted-bracket-blocks splits the bracket with SolidCraft's Split Body
into three slabs across its width, the fillet corner halved along its
diagonal and a four-cell O-grid round each hole; the corpus runner meshes
partitioned parts as one conforming block mesh. A heavy test clamps the
upright, loads the foot and checks hex8 and hex20 converge (hex20 tip
deflection within 0.1 % of a fine tet10 solution). Roadmap M5:
conforming interfaces done.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

crates/testkit/src/corpus.rs

@@ -40,6 +40,7 @@ pub const CATEGORIES: &[(&str, &str)] = &[
     ("blocky", "axis-aligned blocks (polycube-friendly)"),
     ("organic", "free-form, lofted or revolved spline surfaces"),
     ("assembly", "several bodies placed by component transforms"),
+    ("partitioned", "split into cells that each mesh as a mapped block (conforming multi-block hex)"),
     ("analytic", "closed-form geometry for solver verification"),
 ];