M0: truck-based kernel with local fillets and chamfers, parametric document timeline

The kernel moved from monstertruck to truck: truck's booleans handle blind
holes, pockets and bosses that monstertruck's did not (see the ADR). Fillets
and chamfers on straight convex edges between planar faces are our own exact
local B-rep operation. The document holds parameters with unit-aware
expressions and a timeline that re-evaluates incrementally.

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

crates/kernel/src/topo.rs

@@ -174,7 +174,7 @@ pub fn merged_topology(b: &Body, mesh: &Mesh) -> Result<TopoCounts> {
             if !faces.contains(&fi) {
                 faces.push(fi);
             }
-            let mut vix = |v: &monstertruck_modeling::Vertex| {
+            let mut vix = |v: &truck_modeling::Vertex| {
                 let k = format!("{:?}", v.id());
                 let n = vid.len();
                 let i = *vid.entry(k).or_insert(n);