feat(composer): expand ui-system from placeholder to full interview

ui-system skill is no longer a placeholder. Full design-system and
interaction-design interviews with branching, defaults, batched
question clusters, and an 'accept default / skip' protocol so users
move through fast when they have taste and patient when they don't.

Design system interview covers: visual posture, color (with WCAG
contrast verification before writing), typography, spacing, radii,
shadows, density, visual motion, components, theming, and
accessibility tokens (focus ring, hit targets).

Interaction design interview covers: input model, state-surface
declarations per action class, motion posture and triggers,
breakpoints, i18n, four state postures (empty/loading/error/offline),
time formatting, keyboard policy, optimistic-update strategy with
rollback and conflict resolution, gestures, focus management,
notification patterns, selection, and drag-and-drop.

Reference banks for "make it look like Linear/Notion/Stripe/etc."
translate well-known products into starting tokens — user still
confirms each value, no silent invention.

Templates expanded to hold the full output:
- design-system/SKILL.md grew sections for accessibility tokens,
  density, dark-mode mapping, contrast verification, theming variants
- design-system/tokens.ts now exports color (light + dark), typography
  (family/size/weight/line-height/letter-spacing), spacing + density-
  aware padding tokens, radii, shadows, motion (durations + easings),
  z-index scale, breakpoints, hit-target minimums
- design-system/components.md gained anatomy/state/a11y coverage for
  10 primitives plus an "adding a new component" workflow and a
  "patterns to avoid" list (nested cards, color-only meaning, etc.)
- interaction-design/SKILL.md gained sections for optimistic updates,
  conflict resolution, gestures, focus management, notification
  patterns, selection/multi-select, and drag-and-drop

Hard rules: never invent on the user's behalf; <TBD> instead. Verify
contrast before writing color tokens. Always declare prefers-reduced-
motion as honored.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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---
name: <SLUG>-design-system
description: Design system for the <PROJECT NAME> project. Color tokens, typography, spacing, radii, shadows, motion durations, and component vocabulary. Load and apply whenever building UI for this project — generating mocks, writing components, picking colors, configuring Tailwind, styling native screens, building themes, designing CSS, or making any visual decision. The canonical visual reference for this project; if anything visible is being touched, this skill should be in context. Pairs with <SLUG>-interaction-design.
description: Design system for the <PROJECT NAME> project. Color tokens, typography, spacing, radii, shadows, density, motion, accessibility tokens, and component vocabulary. Load and apply whenever building UI for this project — generating mocks, writing components, picking colors, configuring Tailwind, styling native screens, building themes, designing CSS, or making any visual decision. The canonical visual reference for this project; if anything visible is being touched, this skill should be in context. Pairs with <SLUG>-interaction-design.
---
# <PROJECT NAME> design system
> **Status: <draft | reviewed | locked>**
> Generated by Composer's `ui-system` phase. Re-running that phase
> updates this skill (with confirmation).
> updates this skill (with confirmation on overwrite).
## How to use this skill
Whenever you generate or edit UI for this project — a mock, a real
component, a theme, a CSS file — read this SKILL.md and the sidecar
files first, then use the tokens. Do not hardcode values. Do not
introduce new components without proposing them here first.
When generating or editing UI for this project — a mock, a real
component, a theme, a CSS file — read this SKILL.md and `tokens.ts`
first, then use the tokens. Never hardcode visual values. Don't
introduce new components without proposing them in `components.md`.
Sidecar files in this skill directory:
- `tokens.ts` — machine-readable token export. Import in mocks/code.
- `components.md` — component vocabulary with anatomy.
- `components.md` — component vocabulary, anatomy, states.
## Visual posture
<!-- One or two sentences describing the feel. "Quiet, dense, monochromatic with a single brand accent." Or "Playful, generous spacing, expressive type." -->
<!-- One-sentence north star. -->
<TBD: visual posture>
<TBD: visual posture sentence>
## Color
### Brand
- Primary: `<#hex>` — <name>
- (Secondary, if any): `<#hex>` — <name>
- **Primary**: `<#hex>` — <name>
- **Secondary** *(if any)*: `<#hex>` — <name>
### Neutrals
- Tone: <warm | cool | true>
- Scale: 50 / 100 / 200 / 300 / 400 / 500 / 600 / 700 / 800 / 900 / 950
- **Tone**: <warm | cool | true>
- **Scale**: 50 / 100 / 200 / 300 / 400 / 500 / 600 / 700 / 800 / 900 / 950
- See `tokens.ts` for hex values.
### Semantic
| Role | Value |
|---|---|
| Success | `<#hex>` |
| Warning | `<#hex>` |
| Error | `<#hex>` |
| Info | `<#hex>` |
| Role | Light | Dark *(if dark mode)* |
|---|---|---|
| Success | `<#hex>` | `<#hex>` |
| Warning | `<#hex>` | `<#hex>` |
| Error | `<#hex>` | `<#hex>` |
| Info | `<#hex>` | `<#hex>` |
### Dark mode
<TBD: yes / no / system-following + token mapping>
- **Posture**: <yes | no | system-following>
- **Token mapping**: see `tokens.ts` `colorDark` (if applicable)
### Accessibility contrast
- **Target**: WCAG <AA | AAA>
- **Verified pairings** (against `neutral.50` light bg, `neutral.950` dark bg):
- body text: <ratio> — ✅
- UI components: <ratio> — ✅
- <flag any below threshold>
## Typography
- **Display family**: <name>, weights <list>
- **Body family**: <name>, weights <list>
- **Scale base**: <px>, ratio <1.125 | 1.2 | 1.25 | 1.333>
- **Sizes**: xs / sm / base / lg / xl / 2xl / 3xl / 4xl
- **Line-height**: tight for display, normal for body, relaxed for long-form prose
See `tokens.ts` for exact px values.
- **Body family**: <name | "(same as display)">, weights <list>
- **Mono family** *(if used)*: <name>
- **Scale base**: <px>, ratio <1.125 | 1.2 | 1.25 | 1.333 | 1.5>
- **Sizes**: see `tokens.ts` `fontSize` — xs / sm / base / lg / xl / 2xl / 3xl / 4xl
- **Line-height**:
- Tight (display): <value>
- Normal (body): <value>
- Relaxed (long-form): <value>
- **Letter-spacing** *(if customized)*: <values per size class>
## Spacing
- **Base unit**: <4px | 8px>
- **Scale (in base units)**: 0, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 16, 24
- See `tokens.ts` `spacing` for px values.
## Radii
- `sm`, `md`, `lg`, `pill`, `full` — values in `tokens.ts`.
- **Posture**: <sharp | tight | medium | pillowy | mixed>
- `sm` <px> · `md` <px> · `lg` <px> · `pill` 9999px · `full` 9999px
## Shadows
## Shadows & elevation
- `xs / sm / md / lg / xl` — values in `tokens.ts`.
- (Or: "flat — no shadows" if the posture is flat.)
- **Posture**: <flat | subtle | generous>
- Scale: `xs / sm / md / lg / xl` — see `tokens.ts` `shadow`
- (Or "no shadows in this system" if posture is flat — use borders for elevation hierarchy.)
## Density
- **Default**: <comfortable | cozy | compact>
- **Padding tokens**: see `tokens.ts` `padding``tight / default / loose`
- **Component impact**: list components whose default density differs from the global default.
## Visual motion
- **Default duration**: <ms>
- **Default easing**: <named curve or cubic-bezier>
- **Default duration**: <ms> (token: `motion.duration.default`)
- **Default easing**: <named curve> (token: `motion.easing.standard`)
- **Reduced-motion fallback**: linear, instant where appropriate
Behavioral motion (when things animate, what does and doesn't) lives
in the interaction-design skill.
Behavioral motion (when things animate, what triggers them) is in the
**interaction-design** skill, not here.
## Accessibility tokens
- **Focus ring**: <style — solid 2px brand at 60% opacity / etc.>
- **Focus ring color token**: `color.focus`
- **Focus offset**: <px>
- **Hit-target minimum**: 44×44px (mobile) / 32×32px (desktop pointer)
- **Contrast targets**: WCAG <AA | AAA> — body 4.5:1, UI 3:1
## Components
See `components.md` in this directory for the full vocabulary and
anatomy. The TL;DR list:
See `components.md` in this directory for the full vocabulary, anatomy,
and state coverage. The TL;DR list of primitives:
- Button (primary / secondary / ghost / destructive / link)
- Input (text / textarea / select / checkbox / radio / toggle)
- Card / Surface
- (project-specific components from `ia.md`)
- **Button** (primary / secondary / ghost / destructive / link)
- **Input** (text / textarea / select / checkbox / radio / toggle)
- **Card / Surface**
- **Badge / Tag**
- **Avatar**
- **Tooltip**
- **Modal / Drawer / Popover** *(behavioral patterns in interaction-design skill)*
- **Tabs**
- **Menu / Dropdown**
- **Toast / Notification**
Plus project-specific components from `ia.md`: see `components.md`.
## Theming variants
- **Multi-brand / tenant theming**: <yes | no — typically no for v1>
- **Theme-switching mechanism** *(if applicable)*: <CSS variables / data-theme attr / etc.>
## TBD on return
- <TBD: anything the placeholder pass couldn't answer>
<!-- Any phases that were skipped or had unanswered questions in the
ui-system interview. This is the worklist for the next pass. -->
- <TBD: ...>