Remove legacy test files that are no longer used:
- cmd/server/tests/library_test_comprehensive.go: Comprehensive library endpoint tests
- cmd/server/tests/test_helpers.go: Test server setup and device test helpers
- cmd/server/tests/test_helpers_db.go: Database verification utilities
These files appear to be superseded by newer test infrastructure or were part of a test reorganization. Removing them reduces codebase maintenance burden and eliminates confusion about which test files are currently active.
john-okeefe
b8a2dc4b5a