Core engine for the Great Cycle mechanic (GDD Section IV):
- GreatCycleState tracking: cycle number, run within cycle, theme
- RunTrace recording: death position, school, biome, discoveries per run
- Cycle advancement: auto-advance to next cycle after 7 runs
- Great Renewal: resets traces, advances theme, strengthens Mycelium
- 6 narrative themes (Awakening→Doubt→Realization→Attempt→Acceptance→Synthesis)
- Cycle world modifiers: terrain/resources/creatures scale with cycle
- Narrative data JSON with Russian/English lore fragments per theme
- MetaState + persistence + RunState extended with cycle fields
- 38 new tests (549 total), all passing
Co-authored-by: Cursor <cursoragent@cursor.com>
