feat(skills): add verification-before-completion skill

[JeremyDev87]

Summary

• Add new verification-before-completion skill at packages/rules/.ai-rules/skills/verification-before-completion/SKILL.md
• Enforces "Evidence before assertions" iron law — no success claims without running verification commands
• Four mandatory phases: Test Execution, Build Verification, Lint & Quality Check, Diff Review
• Each phase includes concrete commands, checklists, and stop conditions
• Red flags and rationalizations tables matching existing skill patterns (TDD, systematic-debugging)
• Cross-references to related skills (test-driven-development, systematic-debugging)

Test plan

• Markdownlint passes with 0 errors
• Skill follows codingbuddy pattern (frontmatter, core principle, iron law, when to use, four phases)
• v2.0 frontmatter includes name, description, user-invocable
• All four verification areas covered: test, build, lint, diff
• Cross-references to existing skills are valid

Closes #795

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Project	Deployment	Actions	Updated (UTC)
codingbuddy-landing	Ready	Preview, Comment	Mar 22, 2026 1:30am