Rename Step Line to Gig Line

Update the game name in project.godot, export presets, UI/marquee/title strings, packaging (AppImage/NSIS/desktop/appdata), tools, docs, and the generated prop GLBs. Packaging assets and README screenshots are regenerated. Headless suite 209/209 and Python tooling tests pass.

packaging/windows/gig-line.nsi

@@ -1,8 +1,8 @@
-; Step Line Windows installer (NSIS 3).
+; Gig Line Windows installer (NSIS 3).
 ; Build from the repo root with the exported self-contained exe:
-;   makensis /DVERSION=0.2.0 /DARTIFACT=build/step-line-windows-0.2.0.exe \
-;            /DICON=packaging/windows/step-line.ico packaging/windows/step-line.nsi
-; Outputs: build/step-line-setup-<VERSION>.exe
+;   makensis /DVERSION=0.2.0 /DARTIFACT=build/gig-line-windows-0.2.0.exe \
+;            /DICON=packaging/windows/gig-line.ico packaging/windows/gig-line.nsi
+; Outputs: build/gig-line-setup-<VERSION>.exe
 
 !ifndef VERSION
   !define VERSION "0.0.0"
@@ -11,26 +11,26 @@
   !error "ARTIFACT define required (path to exported windows exe)"
 !endif
 !ifndef ICON
-  !define ICON "packaging\windows\step-line.ico"
+  !define ICON "packaging\windows\gig-line.ico"
 !endif
 
 ; The installed executable uses this clean name (no spaces — NSIS /oname tokens
 ; on whitespace, so a spaced name breaks the File directive).
-!define INSTALLED_EXE "step-line.exe"
+!define INSTALLED_EXE "gig-line.exe"
 !ifndef OUT
-  !define OUT "build\step-line-setup-${VERSION}.exe"
+  !define OUT "build\gig-line-setup-${VERSION}.exe"
 !endif
-!define COMPANY "Step Line Project"
-!define UNINST_KEY "Software\Microsoft\Windows\CurrentVersion\Uninstall\Step Line"
+!define COMPANY "Gig Line Project"
+!define UNINST_KEY "Software\Microsoft\Windows\CurrentVersion\Uninstall\Gig Line"
 
 Unicode true
 ManifestDPIAware true
 Icon "${ICON}"
 UninstallIcon "${ICON}"
 
-Name "Step Line ${VERSION}"
+Name "Gig Line ${VERSION}"
 OutFile "${OUT}"
-InstallDir "$PROGRAMFILES64\Step Line"
+InstallDir "$PROGRAMFILES64\Gig Line"
 RequestExecutionLevel admin
 
 Page directory
@@ -47,13 +47,13 @@ Section "Install"
   WriteUninstaller "$INSTDIR\uninstall.exe"
 
   ; Shortcuts
-  CreateDirectory "$SMPROGRAMS\Step Line"
-  CreateShortCut "$SMPROGRAMS\Step Line\Step Line.lnk" "$INSTDIR\${INSTALLED_EXE}"
-  CreateShortCut "$SMPROGRAMS\Step Line\Uninstall.lnk" "$INSTDIR\uninstall.exe"
-  CreateShortCut "$DESKTOP\Step Line.lnk" "$INSTDIR\${INSTALLED_EXE}"
+  CreateDirectory "$SMPROGRAMS\Gig Line"
+  CreateShortCut "$SMPROGRAMS\Gig Line\Gig Line.lnk" "$INSTDIR\${INSTALLED_EXE}"
+  CreateShortCut "$SMPROGRAMS\Gig Line\Uninstall.lnk" "$INSTDIR\uninstall.exe"
+  CreateShortCut "$DESKTOP\Gig Line.lnk" "$INSTDIR\${INSTALLED_EXE}"
 
   ; Registry (Add/Remove Programs)
-  WriteRegStr HKLM "${UNINST_KEY}" "DisplayName" "Step Line"
+  WriteRegStr HKLM "${UNINST_KEY}" "DisplayName" "Gig Line"
   WriteRegStr HKLM "${UNINST_KEY}" "DisplayVersion" "${VERSION}"
   WriteRegStr HKLM "${UNINST_KEY}" "Publisher" "${COMPANY}"
   WriteRegStr HKLM "${UNINST_KEY}" "DisplayIcon" "$INSTDIR\${INSTALLED_EXE}"
@@ -66,9 +66,9 @@ Section "Uninstall"
   Delete "$INSTDIR\${INSTALLED_EXE}"
   Delete "$INSTDIR\uninstall.exe"
   RMDir "$INSTDIR"
-  Delete "$SMPROGRAMS\Step Line\Step Line.lnk"
-  Delete "$SMPROGRAMS\Step Line\Uninstall.lnk"
-  RMDir "$SMPROGRAMS\Step Line"
-  Delete "$DESKTOP\Step Line.lnk"
+  Delete "$SMPROGRAMS\Gig Line\Gig Line.lnk"
+  Delete "$SMPROGRAMS\Gig Line\Uninstall.lnk"
+  RMDir "$SMPROGRAMS\Gig Line"
+  Delete "$DESKTOP\Gig Line.lnk"
   DeleteRegKey HKLM "${UNINST_KEY}"
 SectionEnd