Add life rules and implement tests for civilization and life states

- Introduced a new file `life_rules.txt` to define life progression and degradation rules.
- Created `test_civilization_state.gd` to validate the functionality of civilization rules and ethics.
- Added `test_life.gd` to test life evolution, including initialization, batch processing, and state validation.
- Implemented `civilization_state.gd` to manage civilization ethics and space civilization detachment logic.
- Ensured all tests check for expected outcomes and validate state integrity after operations.

stage/stage.gd

@@ -407,6 +407,7 @@ func load_data() -> bool:
     complete.merge(restored, true)
     owniverse.state = complete
     owniverse.new_state = complete
+    owniverse.initialize_life_batches()
     owniverse.migrate_time_precision()
     owniverse.refresh_item_amounts()
     pending_page = clampi(int(game_data.get("ui", {}).get("current_page", 0)), 0, PAGE_COUNT - 1)