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Migrate test suite from jest to node:test (#342)

* Migrate test suite from jest to node:test

Rewrite all 14 test files to use node's built-in test runner and
node:assert/strict instead of jest's describe/it/expect API. Replace
jest, ts-jest, @types/jest, and eslint-plugin-jest with tsx for running
TypeScript test files through node --test, and add @types/node directly.

* Write lcov file for Coveralls in test:coverage

The previous test:coverage script only printed coverage to stdout via
--experimental-test-coverage, so the coverallsapp action couldn't find
the lcov.info file it expects at coverage/lcov.info. Add the lcov
reporter (alongside spec on stdout) so the file is written, and exclude
the test files themselves from coverage to match the prior jest behavior.

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Co-authored-by: Claude <noreply@anthropic.com>

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