Sovereign RTC64 Specification Checklist & Safe Mode

[rtech-technologies]

This commit creates spec.md with accurate OS feature status tracking, adds Safe-Mode, Normal, and Verbose/Debug boot options to Limine configuration, implements robust command-line argument parsing in early boot, and integrates Safe Mode behavior (skipping compliance task and displaying prominent SAFE MODE indicator).

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PR created automatically by Jules for task 16077479296768598692 started by @rtech-technologies

[google-labs-jules]

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