The source now outputs posix paths; update the test to match instead
of using path.join (which produces backslashes on Windows).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Move 81 tests (18 describe blocks) from single monolithic test file
into 7 domain-specific test files under tests/ with shared helpers.
Test parity verified: 81/81 pass before and after split.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>