R6.6 round 1 fix: no Git says to install ElyTree; Linux keeps Mark's Git

git::own returns git::NoGit when neither the app nor ElyTree has Git;
ElyMark's Git item then reads 'needs ElyTree'. Linux AppImages stand
alone, so ElyMark keeps its Git there (packages share the AppDir).
The bundle fixture now has ElyTree's executable folder.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

packaging/licenses.sh

@@ -88,8 +88,8 @@ case $slug in
     put KaTeX "$katex/fonts/OFL.txt" "$katex/fonts/FONT_NOTICE.txt"
     ;;
 esac
-# ElyTree carries Git.
-if [ "$slug" = ely-tree ]; then
+# ElyTree carries Git; on Linux ElyMark does too.
+if [ "$slug" = ely-tree ] || { [ "$slug" = ely-mark ] && [ "$(uname)" = Linux ]; }; then
   case $(uname) in
     MINGW* | MSYS*) put Git "$root/engines/git/LICENSE.txt" ;;
     *) put Git "$root/engines/git-src/COPYING" "$root/engines/git-src/LGPL-2.1" ;;

packaging/stage.sh

@@ -64,8 +64,8 @@ if [ "$slug" = ely-pdf ]; then
   mkdir "$out/tessdata"
   cp "$tessdata"/{eng,chi_sim,chi_tra}.traineddata "$out/tessdata/"
 fi
-# ElyTree carries Git; ElyMark uses its copy.
-if [ "$slug" = ely-tree ]; then
+# ElyTree carries Git; on Linux, whose AppImage stands alone, ElyMark too.
+if [ "$slug" = ely-tree ] || { [ "$slug" = ely-mark ] && [ "$(uname)" = Linux ]; }; then
   need "$root/engines/git" "scripts/build-git.sh and scripts/fetch-git-lfs.sh"
   cp -R "$root/engines/git" "$out/git"
 fi