Agent Skills: code-design

D-phase skill for the codesmith implementation workflow. Invokes render-design-doc-skeleton.py to overwrite the design.md placeholder with a tag-aware skeleton grounded in R-phase findings. Runs the always-interactive brain-surgery alignment conversation per Lock 6: agent presents each design section, human stress-tests via Question tool per substantive decision, iterate until aligned. Tracks the foundational-reversal strike counter per Lock 31. May identify multiple architecturally-distinct plans (NOT sub-tickets). Hands off to code-structure when D-phase is locked.