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/ui-egui/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
-name = "modelcraft-ui-egui"
-description = "ModelCraft desktop interface (egui + wgpu): viewport, model tree, commands, status bar and the control channel's request handling"
+name = "fieldcraft-ui-egui"
+description = "FieldCraft desktop interface (egui + wgpu): viewport, model tree, commands, status bar and the control channel's request handling"
 version.workspace = true
 edition.workspace = true
 license.workspace = true
@@ -9,12 +9,12 @@ license.workspace = true
 workspace = true
 
 [dependencies]
-modelcraft-model = { workspace = true }
-modelcraft-engine = { workspace = true }
-modelcraft-render = { workspace = true }
-modelcraft-explicit = { workspace = true }
-modelcraft-geometry = { workspace = true }
-modelcraft-decks = { workspace = true }
+fieldcraft-model = { workspace = true }
+fieldcraft-engine = { workspace = true }
+fieldcraft-render = { workspace = true }
+fieldcraft-explicit = { workspace = true }
+fieldcraft-geometry = { workspace = true }
+fieldcraft-decks = { workspace = true }
 egui = { workspace = true }
 craft-ui = { workspace = true }
 egui-wgpu = { workspace = true }