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/geometry/src/lib.rs

@@ -1,6 +1,6 @@
 //! The geometry boundary.
 //!
-//! Meshing in ModelCraft starts from a triangulated boundary surface. This crate produces it:
+//! Meshing in FieldCraft starts from a triangulated boundary surface. This crate produces it:
 //! B-rep bodies come from SolidCraft's kernel (`solidcraft-kernel`, a pinned git dependency;
 //! plan/adr/0001-libraries.md) and leave it as a [`SurfaceMesh`] from SolidCraft's tessellator,
 //! with each triangle tagged by the B-rep face it lies on (for feature edges and for loads and

crates/geometry/src/tagged_mesh.rs

@@ -30,7 +30,7 @@ const MAX_BUILD_ITEMS: usize = 10_000;
 const MAX_XML_DEPTH: usize = 256;
 /// Largest coordinate magnitude accepted, in the file and after units and transforms: the FE
 /// model's own limit, so every imported vertex can become a node.
-use modelcraft_model::MAX_COORD;
+use fieldcraft_model::MAX_COORD;
 /// A transform whose determinant is below this fraction of its largest row length cubed
 /// flattens the object (relative, so a uniform scale is never refused).
 const MIN_RELATIVE_DET: f64 = 1e-12;