docs: show a commerce screen, not just dashboards

[vicmaster]

The v2.1.0 headline is commerce fluency, and every screenshot in the README was a dashboard. This adds a checkout to the "What an agent actually ships" section.

It was built against the published 2.1.0 package, not the working tree — the MCP server runs npx -y framesmith, so this demonstrates what someone installing framesmith today actually gets, rather than what is on master.

How it was built

One generate_design_system call (#A24B1E on the soft personality) for the whole design language, the settings page scaffold adapted into a two-column checkout, a stamped form-field, and real radio / checkbox / input controls rather than frames pretending to be them. Stamped with the new commerce genre, which is the point: the evaluator reads the line prices and the total as the design instead of as fabricated data.

It cleared the same bar as the two dashboards above it — 100/100, zero blocking issues, canvas_stress CLEAN across all five perturbations, correct in both themes — plus designed empty-basket and loading states, which the coverage check demanded before it would call the screen done.

Three things the build surfaced

These are findings, not blockers for this pull request, and none of them are fixed here.

apply_structure silently wipes a genre stamp. I called canvas_set_genre with commerce first, then stamped the page scaffold. Stamping records provenance and overwrote the whole provenance object, so the genre went with it — the next evaluation reported genre.active: null and flagged all six money figures as fabricated. Re-stamping afterwards fixed it and reported previous: null, confirming the stamp was gone rather than replaced. Stamping should merge into provenance instead of replacing it, or apply_structure should preserve an existing preset.

export has no fullPage. Slice E of Phase 29 added fullPage to screenshot but not to export, so exporting a design taller than its artboard still needs the height passed by hand. The two tools should agree.

The eyebrow-rhythm tell counts form-field labels. It fires on text at or below the label role size that is uppercase or letter-spaced — and the soft personality's label role carries letterSpacing: 0.25, so every small label in the design inherited eyebrow tracking and eleven ordinary form labels were counted as eyebrows. Setting the canvas's label role to letterSpacing: 0 fixed it and is the right call for a form-heavy screen anyway, but the tell probably should not count a label that sits directly above an input.

What is and is not committed

Only the image and the README change. The canvases stay local, matching how .framesmith/ui/ has always been treated — just the curated pattern library and design system are checked in, so a new user still starts with an empty store.