test(integration): add specs for the web fixtures

internal/integration/testdata/counter/spec.ts

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+import { always, extract, taps } from "@sanderling/spec";
+
+const counter = extract((s) => {
+  const el = s.ax.find({ id: "counter" });
+  return el ? parseInt(el.text, 10) || 0 : 0;
+}).named("counter");
+
+// The + and - buttons each move the counter by exactly 1, so no step ever
+// changes it by more than 1. A bug that double-applied a click would break this.
+const changesByAtMostOne = always(() => {
+  const previous = counter.previous;
+  if (previous === undefined) return true;
+  return Math.abs(counter.current - previous) <= 1;
+});
+
+export const properties = { changesByAtMostOne };
+
+export const actionsRoot = taps;

internal/integration/testdata/throwing/spec.ts

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+import { taps } from "@sanderling/spec";
+import { noUncaughtExceptions } from "@sanderling/spec/defaults/properties";
+
+export const properties = { noUncaughtExceptions };
+
+export const actionsRoot = taps;