Run the slow specs again

- Removes the skip from Bounties and CreateAccount.
- test:slow runs only the .slow. specs.
- Each step waits up to 20s instead of the 1s default, since it waits on a
  live chain. The previous setting is restored when the file ends.
- assertDevNode fails a spec at once when no dev node answers. Without it the
  api keeps reconnecting and the spec waits until the job's timeout.

packages/test-support/src/bizinikiwi/assertDevNode.ts

@@ -0,0 +1,26 @@
+// Copyright 2017-2026 @pezkuwi/test-support authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import { BIZINIKIWI_PORT } from './constants.js';
+
+/**
+ * Fails at once when no dev node answers on BIZINIKIWI_PORT. Without it an
+ * api keeps reconnecting and a spec waits until the job's timeout.
+ */
+export async function assertDevNode (timeoutMs = 5_000): Promise<void> {
+  const url = `http://127.0.0.1:${BIZINIKIWI_PORT}`;
+  const res = await fetch(url, {
+    body: JSON.stringify({ id: 1, jsonrpc: '2.0', method: 'system_chain' }),
+    headers: { 'Content-Type': 'application/json' },
+    method: 'POST',
+    signal: AbortSignal.timeout(timeoutMs)
+  }).catch((error: Error) => error);
+
+  if (res instanceof Error || !res.ok) {
+    const reason = res instanceof Error
+      ? res.message
+      : `HTTP ${res.status}`;
+
+    throw new Error(`No dev node answers on ${url} (${reason}); the .slow. specs need one`);
+  }
+}

packages/test-support/src/bizinikiwi/index.ts

@@ -1,4 +1,5 @@
 // Copyright 2017-2026 @pezkuwi/test-support authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+export * from './assertDevNode.js';
 export * from './constants.js';