Implement Skill

Purpose

Implement using specs/{feature}/plan.md as the single progress source.

Iron Law: No completion claims without fresh verification evidence. If you haven't run the command in this step, you cannot claim it passes.

Input

• Existing specs/constitution.md when present
• specs/{feature}/spec.md and specs/{feature}/plan.md

Output

• Implemented code with passing tests
• Updated specs/{feature}/plan.md (and spec.md if findings require it)
• Progress log entries with verification evidence