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/tests/delaunay_bench.rs

@@ -1,10 +1,10 @@
 //! Throughput of the Delaunay tetrahedralization on 1M random points and on a 100³ grid (every
 //! cell cospherical). Ignored by default; run with
-//! `cargo test --release -p modelcraft-mesh --test delaunay_bench -- --ignored --nocapture`.
+//! `cargo test --release -p fieldcraft-mesh --test delaunay_bench -- --ignored --nocapture`.
 
 use std::time::Instant;
 
-use modelcraft_mesh::delaunay::Triangulation;
+use fieldcraft_mesh::delaunay::Triangulation;
 
 struct Rng(u64);
 

crates/mesh/tests/predicates_bench.rs

@@ -1,10 +1,10 @@
 //! Throughput and filter hit rate of the exact predicates. Ignored by default; run with
-//! `cargo test --release -p modelcraft-mesh --test predicates_bench -- --ignored --nocapture`.
+//! `cargo test --release -p fieldcraft-mesh --test predicates_bench -- --ignored --nocapture`.
 
 use std::hint::black_box;
 use std::time::Instant;
 
-use modelcraft_mesh::predicates::{
+use fieldcraft_mesh::predicates::{
     GenericPoint, Lpi, Point3, Sign, generic_orient3d, insphere, insphere_filter, insphere_sos, orient3d, orient3d_filter,
 };