Kernel: pole-free six-patch spheres; vendored truck-shapeops with robust meshing and nearest-parameter loop projection (sphere and box booleans work); least-squares sphere classification

Oracle: 25/29 (14 and 15 now match Fusion).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

vendor/truck-shapeops/src/lib.rs

@@ -0,0 +1,37 @@
+//! Crate for operationg shapes. Provides boolean operations to Solid, and shape healing for importing shapes from other CAD systems.
+
+// SolveCraft: warnings are not errors in the vendored copy (newer compilers flag more).
+#![allow(dead_code)]
+#![warn(clippy::all, rust_2018_idioms)]
+#![warn(
+    missing_docs,
+    missing_debug_implementations,
+    trivial_casts,
+    trivial_numeric_casts,
+    unsafe_code,
+    unstable_features,
+    unused_import_braces,
+    unused_qualifications
+)]
+
+/// SolveCraft: report where an operation gives up (set `SHAPEOPS_TRACE`).
+macro_rules! tr {
+    ($e:expr, $tag:expr) => {
+        match $e {
+            Some(v) => v,
+            None => {
+                if std::env::var_os("SHAPEOPS_TRACE").is_some() {
+                    eprintln!("shapeops: gave up at {} ({}:{})", $tag, file!(), line!());
+                }
+                return None;
+            }
+        }
+    };
+}
+pub(crate) use tr;
+
+mod healing;
+pub use healing::{RobustSplitClosedEdgesAndFaces, SplitClosedEdgesAndFaces};
+mod transversal;
+pub use transversal::{and, or, ShapeOpsCurve, ShapeOpsSurface};
+mod alternative;