v1.0.0 - Retro DOS Healthcheck

Initial release of a retro-style DOS health check and system audit toolkit.

Includes:

• Baseline HEALTH.BAT for MS-DOS 3.x, 4.x, 5.x and 6.x
• Extended HEALTH6.BAT for MS-DOS 6.x
• CONFIG.SYS and AUTOEXEC.BAT examples
• sample DOS-REPORT.TXT
• GitHub Actions validation
• GitHub Pages landing page