Rename the project to FieldCraft

Crates fieldcraft-*, binaries fieldcraft and fieldcraft-cli, the .fieldcraft file (format tag
fieldcraft/1, manifest fieldcraft.json), FIELDCRAFT_* environment variables, the MCP server
name, egui widget ids (fc_*), the app icon document FieldCraft.icon and its generated family,
docs and licences. No compatibility shim: no files of the earlier name exist.

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

crates/mesh/src/quad/cdt.rs

@@ -75,7 +75,7 @@ pub(crate) const CLEARANCE: f64 = 0.3;
 /// model's coordinate range.
 fn steiner_point(c: [f64; 2]) -> Option<Point2> {
     let c = [snap_to_domain(c[0]), snap_to_domain(c[1])];
-    if !(c[0].abs() <= modelcraft_model::MAX_COORD && c[1].abs() <= modelcraft_model::MAX_COORD) {
+    if !(c[0].abs() <= fieldcraft_model::MAX_COORD && c[1].abs() <= fieldcraft_model::MAX_COORD) {
         return None;
     }
     Point2::new(c[0], c[1]).ok()

crates/mesh/src/quad/domain.rs

@@ -39,7 +39,7 @@ pub(crate) fn bbox(pts: impl IntoIterator<Item = [f64; 2]>) -> ([f64; 2], [f64;
 /// Admissible exact-predicate point from user coordinates (finite, within the model limit; tiny
 /// magnitudes rounded to zero).
 pub(crate) fn admissible(c: [f64; 2]) -> Result<[f64; 2]> {
-    modelcraft_model::check_coordinates(&c)?;
+    fieldcraft_model::check_coordinates(&c)?;
     Ok([snap_to_domain(c[0]), snap_to_domain(c[1])])
 }
 

crates/mesh/src/quad/free.rs

@@ -22,7 +22,7 @@ pub(crate) fn mesh(loops: &[Vec<[f64; 2]>], size: &dyn SizeField, opts: &QuadOpt
         if l.len() % 2 == 1 {
             return Err(Error::Invalid(format!(
                 "loop {k} has an odd number ({}) of boundary points; an all-quadrilateral mesh needs an even number on every loop \
-                 (choose the edge divisions with modelcraft_mesh::size::loop_divisions or even_divisions)",
+                 (choose the edge divisions with fieldcraft_mesh::size::loop_divisions or even_divisions)",
                 l.len()
             )));
         }

crates/mesh/src/quad/tests.rs

@@ -511,7 +511,7 @@ fn planar_quad_metrics() {
 }
 
 #[test]
-#[ignore = "timing and quality report: cargo test --release -p modelcraft-mesh quad_report -- --ignored --nocapture"]
+#[ignore = "timing and quality report: cargo test --release -p fieldcraft-mesh quad_report -- --ignored --nocapture"]
 fn quad_report() {
     let cases: Vec<(&str, Vec<Vec<[f64; 2]>>, f64)> = vec![
         ("rectangle", vec![rect(0.0, 0.0, 10.0, 5.0, 20, 10)], 0.5),

crates/mesh/src/quad/tfi.rs

@@ -85,7 +85,7 @@ fn grid<const D: usize>(
     let count = (nu + 1).checked_mul(nv + 1).filter(|&c| c <= MAX_GRID_NODES);
     let count = count.ok_or_else(|| Error::Limit(format!("a {nu} × {nv} grid exceeds {MAX_GRID_NODES} nodes")))?;
     for side in [bottom, right, top, left] {
-        modelcraft_model::check_coordinates(side.as_flattened())?;
+        fieldcraft_model::check_coordinates(side.as_flattened())?;
     }
     let corner = |s: &[[f64; D]], last: bool| if last { s.last().copied() } else { s.first().copied() };
     let (p00, p10, p01, p11) = match (corner(bottom, false), corner(bottom, true), corner(top, false), corner(top, true)) {