Fix pre-existing test failures after sol directory merge
- test_seed_entities_observation_formatting: Use distinct entity names
(Alice Nakamura, Ben Okafor, etc.) instead of "Person A/B/C/D" which
fuzzy-matched each other via find_matching_entity
- Update preview agent API baseline to include sol/self.md and
sol/agency.md from fixture journal
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>