refactor(test): run tests via shell script instead of test.js

[watson]

Description

Replaces the Node.js test runner with a shell script so tests are discovered and run from bash instead of require()-based discovery.

• Removed test.js — the previous runner that used fs.readdirSync and require('./test/' + file).
• Added scripts/test.sh — runs top-level test/*.js files and index.js in test subdirectories (skipping wasm), with clear "Running …" output per test.
• Updated package.json — the test script now runs bash scripts/test.sh instead of node test.

Behavior is unchanged: the same tests run in the same order; only the runner implementation and the yarn test / npm test entrypoint change.

Why this approach

• Process isolation — Each test file is run in its own node process. A crash or hang in one test doesn’t take down the whole run, and leaks or global state don’t spill between tests.
• Better failure attribution — The "Running …" line before each test makes it obvious which file failed when something breaks.

[watson]

• refactor(test): run tests via shell script instead of test.js #79 👈 (View in Graphite)
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.