test v1.43.2: smokes that can fail, in CI, and an honest TESTING.md

T1: demo/serve.mjs exports check/checkAll/finish — all 48 smokes now
assert named facts and exit non-zero on a mismatch or an uncaught
in-card exception (verified by breaking the kiosk guard on purpose).
Informational values were frozen from a v1.43.1 run and cross-read
against the source; timings assert budgets, not exact numbers.

T2: new CI job 'smoke' gated on 'frontend', builds a FRESH bundle
before running (the committed demo/srv/assets copy is a snapshot) and
uploads per-file logs on failure.

T3: [auto] now means 'a named failing check exists' and each line names
it (43 lines); 72 aspirational markers honestly downgraded to [manual].
Fixed the 'ZERO edit buttons' contradiction (wrong since v1.30.1) and
the opening-click line (true again since v1.43.1).

Three smokes carried pre-v1.39.0/v1.25 expectations and were testing
old behaviour: tap defaults for lights, card-wide tap action, label drag
requiring plan mode.

DEVELOPMENT.md documents the harness contract.

docs/DEVELOPMENT.md

@@ -96,3 +96,22 @@ Tag `vX.Y.Z` + GitHub Release → the workflow `.github/workflows/release.yml` b
 - The houseplan integration: entry loaded, `.storage/houseplan.layout` — the layout (server-side).
 - The old prototype `/config/www/houseplan/` (iframe) is kept as a fallback, do not touch.
 - configuration.yaml backups: `.bak-avgtemp` (before the average-temperature sensor edit).
+
+
+## Smoke tests (since 2026-07-27)
+
+Every `demo/smoke_*.mjs` ends with:
+
+```js
+checkAll(out);            // every key must be true...
+checkAll(out, { n: 4 });  // ...unless an expected value is given
+await finish(browser, out);
+```
+
+`finish` prints the JSON dump (useful on failure), reports named mismatches and
+sets a non-zero exit code — including when the card threw during the run. The
+suite runs in CI (`smoke` job) against a freshly built bundle; never test the
+committed `demo/srv/assets/houseplan-card.js` snapshot.
+
+When adding a checklist line marked `[auto: ...]` in docs/TESTING.md, add the
+failing check in the same commit — that is what the marker now promises.