fix(standard): refine §3.3 Priority 3 name to "Security by Design"

[UnbreakableMJ]

Summary

• Refines the §3.3 Priority 3 name from the awkward dual form Secure / Security By Design → Security by Design
• "Security by Design" is the established industry term (NIST, OWASP, ISO 27001) and a noun phrase consistent with "Stability" and "Performance"
• Same-day correction to v1.25 (not yet published as release assets); no version bump needed

Test plan

• grep "§3.3" The_Steelbore_Standard.md → shows Security by Design
• No occurrence of Secure / Security By Design remains

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