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>
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>