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 <[email protected]>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

Cargo.toml

@@ -1,6 +1,8 @@
 [workspace]
 resolver = "3"
 members = ["crates/*", "apps/*", "xtask"]
+# Third-party code kept with local fixes (see vendor/README.md); not linted as ours.
+exclude = ["vendor"]
 
 [workspace.package]
 version = "0.1.0"
@@ -68,3 +70,7 @@ opt-level = 3
 lto = "thin"
 codegen-units = 16
 debug = 0
+
+# truck-shapeops with SolveCraft fixes (Apache-2.0, see vendor/truck-shapeops and ATTRIBUTION.md).
+[patch.crates-io]
+truck-shapeops = { path = "vendor/truck-shapeops" }