Squash-merge the verified #412 eval coverage implementation. Required validate and paired evaluation checks passed at exact head b43ac564a5919a0f23fdab49ba052d7c514915cb; droid-review BYOK failure had no findings and is advisory.
Adds the public Vercel Eve Agent Skill, validated through three autonomous greenfield SkillOpt epochs and exact-head CI.\n\nAI-assisted contribution; binding self-review recorded on PR #55.