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/explicit/tests/large_deformation.rs

@@ -13,10 +13,10 @@
 //!
 //! Run with `--nocapture` to see the errors.
 
-use modelcraft_explicit::elements::{Motion, State, Workspace, internal_forces};
-use modelcraft_explicit::system::System;
-use modelcraft_explicit::{ExplicitResult, Failure, Limits, solve_explicit};
-use modelcraft_model::*;
+use fieldcraft_explicit::elements::{Motion, State, Workspace, internal_forces};
+use fieldcraft_explicit::system::System;
+use fieldcraft_explicit::{ExplicitResult, Failure, Limits, solve_explicit};
+use fieldcraft_model::*;
 
 /// A block [0, size] of `n` cells: one hex8 per cell, or six tet4 (Kuhn's split).
 fn block(n: [usize; 3], size: [f64; 3], kind: ElementKind) -> Model {
@@ -179,7 +179,7 @@ impl Driver {
         self.try_go(to, dt).unwrap()
     }
 
-    fn try_go(&mut self, to: impl Fn([f64; 3]) -> [f64; 3], dt: f64) -> modelcraft_explicit::Result<[f64; 6]> {
+    fn try_go(&mut self, to: impl Fn([f64; 3]) -> [f64; 3], dt: f64) -> fieldcraft_explicit::Result<[f64; 6]> {
         let mut du = vec![0.0; self.u.len()];
         for (i, x0) in self.sys.xyz.iter().enumerate() {
             let x = to(*x0);

crates/explicit/tests/one_d.rs

@@ -9,9 +9,9 @@
 
 use std::f64::consts::PI;
 
-use modelcraft_explicit::{ExplicitResult, Limits, solve_explicit};
-use modelcraft_fem::truss::axial;
-use modelcraft_model::*;
+use fieldcraft_explicit::{ExplicitResult, Limits, solve_explicit};
+use fieldcraft_fem::truss::axial;
+use fieldcraft_model::*;
 
 fn model(step: ExplicitDynamic) -> Model {
     let mut m = Model::default();

crates/explicit/tests/thermal.rs

@@ -2,8 +2,8 @@
 //! a free bar by α ΔT L without stress; a bar held at both ends carries σ = −E α ΔT, and with
 //! perfectly plastic J2 the stress stops at the yield stress.
 
-use modelcraft_explicit::{Limits, solve_explicit};
-use modelcraft_model::*;
+use fieldcraft_explicit::{Limits, solve_explicit};
+use fieldcraft_model::*;
 
 const YOUNG: f64 = 1.0e4;
 const ALPHA: f64 = 1.0e-4;
@@ -115,7 +115,7 @@ fn a_clamped_bar_carries_minus_e_alpha_dt_up_to_yield() {
         let r = solve_explicit(&bar(kind, true, Some(plastic)), None, &Limits::default()).unwrap();
         let last = r.frames.last().unwrap();
         for (s, ep) in last.stress.iter().zip(&last.plastic_strain) {
-            let mises = modelcraft_fem::von_mises(s);
+            let mises = fieldcraft_fem::von_mises(s);
             assert!((mises - 0.5 * sigma.abs()).abs() < 0.02 * sigma.abs(), "{kind:?}: {s:?}");
             assert!(*ep > 0.0, "{kind:?}: plastic strain {ep}");
         }

crates/explicit/tests/verification.rs

@@ -5,8 +5,8 @@
 //! The bar has Poisson's ratio 0, so a uniaxial stress wave travels at the rod speed c = √(E/ρ)
 //! without lateral inertia effects (d'Alembert's solution of the one-dimensional wave equation).
 
-use modelcraft_explicit::{ExplicitResult, Limits, solve_explicit};
-use modelcraft_model::*;
+use fieldcraft_explicit::{ExplicitResult, Limits, solve_explicit};
+use fieldcraft_model::*;
 
 const YOUNG: f64 = 1.0e4;
 const DENSITY: f64 = 1.0;