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fix(visual): deterministic baselines + vendored lit (WHYNOT-WP-0002 T11)

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Regenerate the four whynot-control visual baselines against the T06 token
regen, and make the harness render deterministically:

- serve.json (cleanUrls:false): serve was 301-redirecting /…/index.html and
  stripping the trailing slash, shifting the document base so every relative
  asset 404'd (also broke `pnpm showcase` in a browser).
- examples/whynot-control/index.html: token stylesheet pointed at a
  non-existent root path; repoint to ../../src/styles/colors_and_type.css so
  the page actually loads the T06 tokens.
- examples/vendor/lit.js: vendor a self-contained esbuild lit bundle and point
  the showcase importmap at it, removing the multi-hop live esm.sh dependency.
- tests/visual/ui-kit.spec.mjs: abort the unused Google-Fonts CDN (fonts are
  system-ui post-IBM-Plex); a hung font request blocked module execution.

The showcase "every component" test is marked test.fixme: that page wedges the
renderer main thread (a demo composition loops) and has never produced a
baseline. Tracked as WHYNOT-WP-0002-T11. Components + vendored lit render fine
in isolation; the four control baselines pass deterministically.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Bernd Worsch
2026-06-26 21:08:06 +02:00
parent 0d688ca94a
commit 0f96736bb7
12 changed files with 102 additions and 5 deletions
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27
workplans/WHYNOT-WP-0002-designbook-stack-adapters.md
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@@ -212,6 +212,33 @@ the Lit component and diff against `ir/exemplars/<Name>` using the existing Play
emit a parity diff. Produce a single parity result per the adapter contract (T02). This is the
gate that confirms Lit actually matches the designbook appearance.
## Fix showcase page render hang (visual-baseline gate)
```task
id: WHYNOT-WP-0002-T11
status: todo
priority: medium
```
Discovered 2026-06-26 while regenerating visual baselines after the T06 token
regen. The `examples/showcase/index.html` "every component" page wedges the
renderer main thread when its module executes — the page never reaches `load`
and no `showcase.png` baseline can be captured (it has never existed). Isolated:
the components + the vendored lit bundle render fine in a minimal page with a
mounted `<wn-button>`, so the loop is triggered by a *specific demo composition*
on the showcase page, not by lit or the element classes. The four
`examples/whynot-control` baselines are unaffected and pass deterministically.
The showcase test is marked `test.fixme` in `tests/visual/ui-kit.spec.mjs` until
this is fixed — remove `.fixme` and regenerate the baseline once the looping
component/usage is found (bisect the showcase demos).
Related fixes landed alongside this discovery (same commit): `serve.json`
(`cleanUrls:false` — serve was 301-redirecting `index.html` and breaking every
relative asset); corrected the whynot-control token stylesheet link
(`../../colors_and_type.css` → `../../src/styles/colors_and_type.css`); vendored
lit as `examples/vendor/lit.js`; and aborted the unused Google-Fonts CDN in the
visual tests for determinism.
---
## Phase 5 — Keep-up-to-date instruction set