test(design-motion): run design-motion-showcase in the marathon tier; the periodic census is at its 38-slice cap (GSTA-92)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -22,7 +22,7 @@
 - `test/design-craft.test.ts`: every tell with its count; a finished page, inlined Pretext, a `100vh` line with its `100dvh` fallback, discount copy and in-page anchors stay clean; look-alike attributes, encoded markers, `!important` and reversed fallbacks; skip links judged by position and target in any language; the craft section's banned words and names all flagged; CLI exit codes.
 - `design-html-slop-gate` also requires the craft check to run once or twice; the design-html carve guard requires the craft section read.
 - `test/motion-capture.test.ts`, `test/motion-encode.test.ts`: step and clock math (the seam frame lands exactly one cycle later for every PRE and cycle tried), argument errors, the exact export recipes, check frame selection for both layouts, PSNR parsing and verdicts (fewer compared frames than planned fails), and the `FFMPEG_MISSING` path, all without a browser, ffmpeg or network.
-- New paid case `design-motion-showcase` (`test/skill-e2e-design.test.ts`): a finalized page goes through rebuild, capture, checks and export, and the agent must read the fidelity and motion sections and run `check` before `export`. The design-motion carve guard points at it.
+- New paid case `design-motion-showcase` (`test/skill-e2e-design.test.ts`): a finalized page goes through rebuild, capture, checks and export, and the agent must read the fidelity and motion sections and run `check` before `export`. The design-motion carve guard points at it. It runs in the marathon tier as a 3-trial behavior panel, because the periodic census is at its 38-slice cap and three 3-6 minute trials would add two slices; it needs ffmpeg and Chromium on the runner. Its section-read and ordering checks accept a full `cat` of a section and capture, check and export in one Bash call (a free replay of the first panel's three captures passes; a `grep` of a section, no `check`, and export before check still fail).
 
 ## [1.91.218.0] - 2026-10-25
 

test/helpers/touchfiles-data.ts

@@ -1449,7 +1449,7 @@ export const E2E_TIERS: Record<string, 'gate' | 'periodic' | 'marathon'> = {
   'design-review-detector-shim-dom': 'gate',   // same shim, DOM mode through the browse binary's dump; self-skips when the binary is absent
   'design-review-plugin-handoff': 'gate',
   'design-html-slop-gate': 'periodic',         // one-pass gate behavior is a judgment call on a fake engine's fixed output
-  'design-motion-showcase': 'periodic',       // a showcase capture is a judgment-heavy creative run; it needs ffmpeg and Chromium
+  'design-motion-showcase': 'marathon',       // a full capture-check-export flow (3-6 min a trial) that needs ffmpeg and Chromium; the periodic census is at its 38-slice cap
 
   // /diagram — triplet is deterministic functional (gstack-render falls back
   // to the browse daemon, so CI runs it); judge is a quality benchmark