chore(standards): apply doctrine-aligned baseline updates

[tinmanworks]

Summary

• apply doctrine-aligned baseline standardization updates
• add security disclosure baseline (SECURITY.md)
• improve template onboarding documentation consistency
• include CI/protection readiness updates where applicable

Doctrine References

• repo-management.md
• project-standards.md
• doctrine-governance.md

Checklist

• aligns with commit/signing/protection policy intent
• avoids migration of existing legacy CI/release systems
• keeps changes minimal and low risk

Risk

• low to moderate depending on repository (workflow additions may require branch-protection follow-up)