## Why
`morfo:check` validates single-state DOM at page load; `smoke` catches
hydration-time errors. Neither ejercices state TRANSITIONS — and that is
where every reactivity bug we caught this week actually lived:
- toolbar A35 loop (mount-time, not caught by either)
- form A36 microtask loop (mount-time with onChange)
- slider RTL transform (static value, off-by-thumb-width)
All passed the existing CI. All would have failed a "click, re-validate"
pass.
## What
- **`scripts/permutation-check.ts`** — Playwright runner. For each demo,
collects `data-perm-step="N"` elements, executes them in ascending
order (re-discovering after each step so portal-gated controls get
counted), and re-validates the component's morfo + captures any
`pageerror` / `console.error` between steps.
- **`data-perm-*` authoring convention** — step index, human label, mode
(click / focus / type / key), settle delay, skip-validate flag. Demos
opt in incrementally; the runner SKIPs annotation-less pages without
failing.
- **`src/uix/morfo/PERMUTATION_RUNNER.md`** — full design doc covering
what it validates, the annotation convention, example, failure format,
and v2–v4 roadmap (URL-driven states → morfo-inferred cycles →
MutationObserver ordering for Sema).
- **COMPONENT_GUIDE A37 + checklist item 40** — instrumentation is now a
ship-gate rule; doc lists coverage targets (overlays / toggleables /
composite roving / forms / RTL) and explicit skips (alerts, file
pickers).
- **`npm run perm:check`** — pipeline entry, exit codes 0/1/2
parallelling `morfo:check`.
## Instrumented demos (v1 seed)
- dialog — 2 steps: open via trigger → close via Close button. Step 1 is
inside `{#if open}` + Portal; runner's dynamic re-discovery handles it.
- tabs — 3 steps: initial tab 1 → switch to tab 2 → switch to tab 3.
- toolbar — 3 steps: toggle bold / italic / underline GroupItems
(exercises the A35 pattern that previously looped).
Result: 8/8 permutations pass; 63 demos SKIPPED pending instrumentation.
## Verification
- `npm run check`: 0 errors in soma/morfo/scripts scope.
- `npm run smoke`: 65/65 routes.
- `npm run morfo:check`: 66/66 morfos.
- `npm run perm:check`: 3/3 instrumented demos, 8/8 permutations.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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