Back to mocha!

sorry i ever left you dear mocha

node:test has two major issues:
* --bail does not work and requires strange modules and incantations.
I was able to work around this with a custom module.

* the test reporter reports _after_ the suite is run. this makes debugging
really hard. the debugs that we print all happen before the test suite summary.
poor design overall.

src/test/datalayout-test.js

@@ -1,5 +1,4 @@
-import { describe, it } from 'node:test';
-
+import { describe, it } from 'mocha';
 import DataLayout from '../datalayout.js';
 import assert from 'node:assert/strict';