Update export presets, project version, and enhance civilization simulation rules

- Updated export path and version code in export_presets.cfg
- Changed project version in project.godot to 0.7.0
- Expanded simulation rules in simulation_rules.md to clarify resource management
- Improved testing framework in tests/README.md to include new civilization budget checks
- Added new tests for batch boundaries and civilization state transitions
- Enhanced civilization_state.gd with shared budget and transition logic
- Refactored owniverse.gd to enforce capacity during life batch initialization

tests/test_civilization_state.gd

@@ -41,6 +41,7 @@ func run() -> void:
     check(global.CivilizationRules.size() == 43, "Load all ethical civilization stages")
     for row: Dictionary in global.CivilizationRules.values():
         check(row.ethics.size() == 6, "Every ethical stage has six rules")
+    world.state.amount.RD = 12.0
     world.state.amount["C0.2"] = 8.0
     world.state.binds.RD = {"C2.0": 12.0, "C1.9": 3.0}
     world.initialize_life_batches()
@@ -65,11 +66,62 @@ func run() -> void:
     dispose(restored)
     dispose(world)
     world = fixture()
+    world.state.amount.RD = 10.0
     world.entities["C1.9"].output_and = {"C2.0": 1.0}
     world.state.binds.RD = {"C1.9": 10.0}
     world.state.batches["C1.9"] = [{"amount": 10.0, "start_year": 1.0, "end_year": 1.0}]
     world._evolve_batches(world.state, 1.0)
     check(world.state.amount["C2.0"] == 10.0 and world.state.binds.RD.get("C2.0", 0.0) == 0.0, "Space successor does not inherit planetary binding")
     dispose(world)
+    var capacity = load("res://world/owniverse/civilization_state.gd")
+    world = fixture()
+    world.state.amount.RD = 10.0
+    world.state.amount["C2.0"] = 8.0
+    var budget: Dictionary = capacity.stellar_budget(world, world.state, global.CivilizationRules)
+    check(capacity.admit_transition(budget, global.CivilizationRules, "C1.9", "C2.0", 5.0) == 2.0, "Growth consumes only remaining stellar capacity")
+    check(capacity.admit_transition(budget, global.CivilizationRules, "C1.9", "C2.0", 5.0) == 0.0, "A reservation cannot be spent twice")
+    world.state.amount["C2.0"] = 1.0
+    budget = capacity.stellar_budget(world, world.state, global.CivilizationRules)
+    check(capacity.admit_transition(budget, global.CivilizationRules, "C2.0", "C2.1", 1.0) == 1.0, "A transition reuses the source reservation")
+    check(budget.free.DwStar == 0.0, "C2.1 reserves ten dwarf stars")
+    world.state.amount["C2.0"] = 0.0
+    world.state.binds.SC = {"RD": 10.0}
+    budget = capacity.stellar_budget(world, world.state, global.CivilizationRules)
+    check(budget.capacity.DwStar == 20.0, "Stars inside structures are counted once")
+    dispose(world)
+
+    world = fixture()
+    world.state.amount.RD = 12.0
+    world.state.amount["C2.1"] = 2.0
+    world.state.amount["C2.0"] = 5.0
+    world.initialize_life_batches()
+    check(world.state.amount["C2.1"] == 1.0 and world.state.amount["C2.0"] == 2.0, "Shared budget supports advanced civilizations first")
+    check(world.state.binds.RD["C1.9"] == 4.0, "Excess cascades to supported planetary stage")
+    var snapshot: Dictionary = world.state.duplicate(true)
+    world.initialize_life_batches()
+    check(world.state == snapshot, "Capacity enforcement is idempotent")
+    world.state.amount.RD = 0.0
+    world.initialize_life_batches()
+    check(world.state.amount["C2.1"] == 0.0 and world.state.amount["C2.0"] == 0.0, "Vanished stars force all unsupported space civilizations down")
+    check(world._physical_amounts(world.state)["C1.9"] == 7.0, "Forced degradation conserves civilizations")
+    dispose(world)
+
+    world = fixture()
+    world.state.amount.SMBH = 2.0e22
+    world.state.amount["C4.2"] = 3.0
+    world.initialize_life_batches()
+    check(world.state.amount["C4.2"] == 2.0, "SMBH capacity uses stellar mass equivalent")
+    check(world._physical_amounts(world.state)["C1.9"] == 1.0, "Unsupported civilization degrades through missing habitat families")
+    check(root.get_node("SaveManager").validate_data({"state": world.state}) == "", "Capacity-limited state validates")
+    dispose(world)
+
+    world = fixture()
+    world.state.amount.RD = 2.0
+    world.entities["C1.9"].output_and = {"C2.0": 1.0}
+    world.state.binds.RD = {"C1.9": 5.0}
+    world.state.batches["C1.9"] = [{"amount": 5.0, "start_year": 1.0, "end_year": 1.0}]
+    world._evolve_batches(world.state, 1.0)
+    check(world.state.amount["C2.0"] == 2.0 and world.state.binds.RD["C1.9"] == 3.0, "Unfunded transition retains the original planetary civilization")
+    dispose(world)
     print("Civilization state: %d checks, %d failures" % [checks, failures])
     quit(0 if failures == 0 else 1)