Remove Track B terminology from compliance docs; move control register to own page

[spoorcc]

Track A/B is not standard CRA terminology, so replace with plain language
(risk-driven / compliance-only). The Final Control Register table moves to
a dedicated control_register.rst page to keep the compliance page focused.
The compliance page gains a status-key rubric and horizontal rules between
sections for readability.

https://claude.ai/code/session_01TzCDwHkJbD5jNtRXBXYT2a

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Reviewing files that changed from the base of the PR and between 0c54e11 and 0ca92aa.

📒 Files selected for processing (3)

• doc/explanation/compliance_track.rst
• doc/explanation/control_register.rst
• doc/explanation/security.rst

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