fix: use dynamic pkg metadata in tests

[yimsk]

Summary

• Test fixtures and assertions in index.test.ts had hardcoded name/version/description strings
• Version bump to 0.1.1 broke CI because test still expected "0.1.0"
• Now reads all metadata from package.json dynamically — no more breakage on version bumps

Changes

• tests/index.test.ts: read package.json at module scope, use pkg.name, pkg.version, pkg.description in fixture generation and assertions