- Register StorytellerPlugin in main() and dump_schedule_graph() so
contamination system runs in production (critical, rounds 2+3)
- Add doc comment to z_bands_connected clarifying band indices vs
absolute z-levels (D-110)
- Add TODO on hardcoded modifications: vec![] in save_to_file
- Init ContaminationActive in minimal_world() test helper
- Replace ChaCha20Rng with SimRng in fuzzy_map tests (D-010)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>