Update speed limit, enable embedded PCK format, and enhance brown dwarf production logic

tests/test_stellar_rules.gd

@@ -168,6 +168,65 @@ func run() -> void:
     check(world.state.binds.RD.HP >= 1.0, "Automatic formation also creates planets")
     dispose(world)
 
+    world = fixture()
+    world.entities.N.auto = 1.0
+    # 1000 newly produced automatic H reserve 1 H, enough for 10 HBD.
+    world.evolute(100.0)
+    check(world.state.amount.HBD == 10.0, "Brown dwarfs form without existing ordinary stars")
+    check(world.state.amount.H == 999.0 and world.state.auto_resources.H == 999.0, "Brown dwarfs consume exactly their reserved hydrogen")
+    check(world.get_item_amounts().BD == 10.0 and world.state.batches.HBD.size() > 0, "Brown dwarfs appear in counter and evolution batches")
+    world.entities.N.product_per_year_amount = 0.0
+    world.evolute(100.0)
+    check(world.state.amount.HBD == 10.0, "Stored automatic budget is not taxed repeatedly")
+    dispose(world)
+
+    world = fixture()
+    world.entities.N.auto = 1.0
+    world.state.amount.RD = 1.0
+    world.evolute(50.0)
+    check(world.state.amount.HBD == 5.0 and is_equal_approx(world.state.auto_star_deficits.HBD_fuel, 0.5), "Individual dwarfs retain prepaid fractional fuel")
+    check(world.state.amount.H == 0.0, "Prepaid fuel is not available to ordinary stars")
+    var resumed = fixture()
+    resumed.entities.N.auto = 1.0
+    resumed.state = bytes_to_var(var_to_bytes(world.state))
+    world.evolute(50.0)
+    resumed.evolute(50.0)
+    check(world.state.amount.HBD == 10.0, "Accumulated quota eventually creates a whole batch")
+    check(world.state == resumed.state, "Brown dwarf quota survives serialization deterministically")
+    check(world.state.amount.RD == 1000.0 and world.state.amount.H == 0.0, "Shared automatic hydrogen is spent once")
+    world.state.batches.HBD = [{"amount": 10.0, "start_year": 101.0, "end_year": 101.0}]
+    world._evolve_batches(world.state, 101.0)
+    check(world.state.amount.HBD == 0.0 and world.state.amount.CBD == 10.0 and world.get_item_amounts().BD == 10.0, "Cooling preserves aggregate brown dwarf count")
+    dispose(resumed)
+    dispose(world)
+
+    world = fixture()
+    var saw_individual: bool = false
+    for i in range(250):
+        world.state.amount.H += 1.0
+        world.state.auto_resources.H = world.state.auto_resources.get("H", 0.0) + 1.0
+        var before: float = world.state.amount.HBD
+        world._produce_brown_dwarfs(world.state, 1.0, float(i), float(i + 1))
+        var born: float = world.state.amount.HBD - before
+        check(born == 0.0 or born == 1.0, "Small fuel increments produce individual dwarfs")
+        saw_individual = saw_individual or born == 1.0
+    check(saw_individual, "Random rounding does not wait for ten dwarfs")
+    resumed = fixture()
+    resumed.state = bytes_to_var(var_to_bytes(world.state))
+    for i in range(250, 500):
+        for simulation in [world, resumed]:
+            simulation.state.amount.H += 1.0
+            simulation.state.auto_resources.H += 1.0
+            simulation._produce_brown_dwarfs(simulation.state, 1.0, float(i), float(i + 1))
+    check(world.state == resumed.state, "Random sequence and prepaid fuel survive saving")
+    check(is_equal_approx(world.state.amount.H + world.state.amount.HBD * 0.1 + world.state.auto_star_deficits.HBD_fuel, 500.0), "Individual production conserves fuel including prepaid reserve")
+    check(is_equal_approx(world.state.amount.HBD + world.state.auto_star_deficits.HBD, 5.0), "Signed remainder preserves the 0.1 percent allocation")
+    var paused_count: float = world.state.amount.HBD
+    for i in 10: world._produce_brown_dwarfs(world.state, 0.0, 500.0, 501.0)
+    check(world.state.amount.HBD == paused_count, "No repeated random attempts without new fuel")
+    dispose(resumed)
+    dispose(world)
+
     # Two simultaneous successors share surviving planets in the same 99:1 ratio.
     world = fixture()
     world.entities.HRG.destroy_level = 0