macharden v1.4.0

feat(ui): enrich terminal CLI aesthetics and generate unified termina…

…l+HTML demo GIF

- Elevate terminal CLI banner with box-drawing metadata card and sleek alignment
- Add domain icons to section headers (Hardening, Network, Secrets, Persistence)
- Enhance check result rows with status icons, severity badges, and quick remediation hints
- Redesign executive summary with rounded cards, score bar, and structured remediation findings
- Add scripts/generate_demo_gif.py combining rich terminal scan and interactive HTML5 dashboard
- Update assets/demo.gif showcasing terminal audit execution and Liquid Glass dashboard walkthrough

chore: prepare macharden v1.4.0

Update runtime and report versions, publish the changelog, refresh the synthetic demo, and align supported-version documentation.