- Eliminated all references to PNG and ZLIB dependencies in CMake configuration and project files.
- Updated documentation to reflect the removal of PNG support and related functionalities.
- Adjusted build scripts and source files to remove unused code related to PNG handling, ensuring a cleaner codebase.
- Introduced `is_systemd_available`, `start_userland_agent`, and `stop_userland_agent` functions to manage a userland background agent when systemd is not available.
- Updated installation logic to start the userland agent if systemd is not detected, enhancing compatibility across different Linux environments.
- Enhanced uninstallation process to stop the userland agent if it was running, ensuring a clean removal of the agent.
- Introduced a `systemctl_user` function in `agent.sh` to handle systemd user commands with session bus configuration in headless environments.
- Updated existing systemctl commands to utilize the new wrapper, enhancing compatibility and user experience on Linux systems.
- Added warnings for missing user bus to guide users in enabling lingering sessions.
- Introduced a new `agent.sh` script to manage background agent functionality for YAZE on macOS and Linux.
- Implemented subcommands for installation, uninstallation, one-shot execution, and a watch mode using inotify.
- Added support for environment variable configuration and platform-specific installation procedures.
- Enhanced user experience with detailed usage instructions and logging for build and test processes.
