kernel: crate root follows the emboss, lip and delete-face port

assemble (records rebuilt after removing and adding faces) joins; the boolean guards that re-ran
a failed boolean with a changed tool (bore_guard, candidate_reach, sphere_lens, tangent_cylinders,
touching_walls) are gone; the lens-cut result stays as a boolean test. SMLIB_REV at the fork's
integration head with smlib_merge_faces.

(not built: base in progress)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt

crates/kernel/src/lib.rs

@@ -12,6 +12,7 @@
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![forbid(unsafe_code)]
 
+mod assemble;
 mod backend;
 mod blend;
 mod blend_corner;
@@ -24,12 +25,10 @@ mod body;
 mod boolean_diagnostics;
 mod boolean_guard;
 mod boolean_record;
-mod bore_guard;
 mod boundary;
 mod boundary_network;
 mod bridge;
 mod build;
-mod candidate_reach;
 #[cfg(test)]
 mod chamfer_sides_curved_tests;
 mod clearance;
@@ -125,7 +124,8 @@ mod smlib_sweeps;
 #[cfg(test)]
 mod smlib_sweeps_tests;
 mod smooth_edges;
-mod sphere_lens;
+#[cfg(test)]
+mod sphere_lens_tests;
 mod spline_conv;
 mod splitface;
 mod step;
@@ -143,7 +143,6 @@ mod surfaces;
 mod sweep_path;
 #[cfg(test)]
 mod sweep_rails_tests;
-mod tangent_cylinders;
 mod tess;
 #[cfg(test)]
 mod thin_face_tests;
@@ -152,7 +151,6 @@ mod thread_display_tests;
 #[cfg(test)]
 mod thread_tests;
 mod topo;
-mod touching_walls;
 mod tspline;
 #[cfg(test)]
 mod untouched_faces_tests;

crates/kernel/src/offset_backend.rs

@@ -51,7 +51,7 @@ fn points(p: &[Vec3]) -> Vec<[f64; 3]> {
 
 /// Runs `op` on `b` in SMLib, tagged as operand 0, and brings the result back with SMLib's
 /// history over `[b]` (none where an order cannot be matched).
-fn run(name: &str, b: &Body, op: impl FnOnce(&Brep) -> std::result::Result<Brep, SmError>) -> Result<(Body, Option<History>)> {
+pub(crate) fn run(name: &str, b: &Body, op: impl FnOnce(&Brep) -> std::result::Result<Brep, SmError>) -> Result<(Body, Option<History>)> {
     b.require_brep(name)?;
     let (sb, ob) = smlib_body_ordered(b)?;
     let tagged = sb.tagged(0).map_err(|e| failed(name, "tag", e))?;

crates/smlib/SMLIB_REV

@@ -1 +1 @@
-c899502f2bdd0e8e21c25e69eca423f659c9da8f
+9c97a665559072ab58b2483465ad8378fc623317