Build

Building: $ARGUMENTS.

1. Run project-system.py. Adopt what exists before adding anything. python3 .claude/skills/ordinary-interfaces/scripts/project-system.py .
2. Read the seven gates. They constrain the solution space before you draw, which is cheaper than discovering them in review.
3. Load the reference files for the surfaces involved, using the routing table in the ordinary-interfaces skill.
4. Take values from the project, then the reference, never from memory. The whole point is that these numbers are checked. Guessing "probably 1.4 line-height" defeats it.
5. Work greyscale first. If hierarchy fails without colour, colour will not fix it (greyscale). Then apply the 60-30-10 split.
6. Enumerate the non-happy states before writing markup (state-ledger) and build the hardest one first. A layout that survives its worst state survives its best; the reverse is not true. sad-paths owns that workflow in depth.
7. Verify contrast with contrast.py before claiming a pair passes.