Fix indirect call to null error and logging.sh worktree support

wxwidgets submodule:
- Add m_isCreated flag to skip UpdateElementRegistry() during construction
- Prevents virtual method calls on partially constructed objects

scripts/common/logging.sh:
- Change -d to -e for .git check to support git worktrees

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/common/logging.sh

@@ -27,7 +27,7 @@ _SCRIPT_NAME="$(basename "${_CALLER_SCRIPT}" .sh)"
 
 # Find project root (walk up looking for .git)
 _PROJECT_ROOT="${_CALLER_DIR}"
-while [[ ! -d "${_PROJECT_ROOT}/.git" ]] && [[ "${_PROJECT_ROOT}" != "/" ]]; do
+while [[ ! -e "${_PROJECT_ROOT}/.git" ]] && [[ "${_PROJECT_ROOT}" != "/" ]]; do
     _PROJECT_ROOT="$(dirname "${_PROJECT_ROOT}")"
 done