Exclude test files from build and runner

[gndelia]

Summary

• Exclude *.test.ts and *.test.tsx from tsconfig.json so tsc no longer compiles test files into _esm/
• Add exclude to vitest config so test discovery skips _esm/ build output

No need to generate a release for this

Closes #11

Test plan

• npm run build produces no *.test.* files in _esm/
• npx vitest run only runs tests from src/, not _esm/
• All 24 tests pass

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR addresses issue #11 by preventing tests from being compiled into the _esm/ build output and by ensuring Vitest doesn’t discover/run tests from _esm/ after a local build.

Changes:

• Update tsconfig.json to exclude src/**/*.test.ts(x) from TypeScript compilation (so tests aren’t emitted into _esm/ / _types/).
• Update vitest.config.ts to exclude _esm/ from test discovery.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
vitest.config.ts	Adds a Vitest exclude pattern to skip tests under _esm/.
tsconfig.json	Excludes *.test.ts(x) from the TS project so build output won’t include tests.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 2 changed files in this pull request and generated no new comments.

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