- Remove mock-based tests from plugin tests (headers, singlefile, ublock, captcha2)
- Replace fake cache tests with real double-install tests that verify cache behavior
- Add SCHEMA_0_8 and seed_0_8_data() for testing 0.8.x data directory migrations
- Add TestMigrationFrom08x class with comprehensive migration tests:
- Snapshot count preservation
- Crawl record preservation
- Snapshot-to-crawl relationship preservation
- Tag preservation
- ArchiveResult status preservation
- CLI command verification after migration
- Add more CLI tests for add command (tags, multiple URLs, file input)
- All tests now use real functionality without mocking
