Fix Node test discovery

[Hhh2178]

What changed

• Update the test script to explicitly run tests/*.test.mjs.
• Add the required daily work log for the fix.

Root cause

node --test tests treats tests as a module path in the affected Node.js environment instead of discovering the test files inside that directory, causing MODULE_NOT_FOUND.

Impact

npm test and the GitHub Actions test job now execute the repository's nine Node built-in tests correctly.

Validation

• npm run harness:verify:project
• npm run type-check
• npm test — 9 passed, 0 failed
• git diff --check