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Migrate to Node.js built-in test runner (#41)

Replace mocha and sinon with Node.js native test framework to eliminate
devDependencies and security vulnerabilities.

Changes:
- Replace mocha test runner with node:test
- Replace sinon.spy() with t.mock.fn() from node:test
- Remove mocha and sinon from devDependencies
- Import describe, it, before from node:test
- Remove done() callbacks (not needed in Node test runner)
- Combine dependent tests into single cohesive test

All 32 tests pass with zero external dependencies.

Fixes #39

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

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