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/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
-name = "modelcraft-geometry"
-description = "ModelCraft's geometry boundary: CAD import, measures and tessellation, implemented with SolidCraft's B-rep kernel"
+name = "fieldcraft-geometry"
+description = "FieldCraft's geometry boundary: CAD import, measures and tessellation, implemented with SolidCraft's B-rep kernel"
 version.workspace = true
 edition.workspace = true
 license.workspace = true
@@ -9,7 +9,7 @@ license.workspace = true
 workspace = true
 
 [dependencies]
-modelcraft-model = { workspace = true }
+fieldcraft-model = { workspace = true }
 solidcraft-geom = { workspace = true }
 solidcraft-kernel = { workspace = true }
 solidcraft-doc = { workspace = true }