Take planets by killing what defends them

#211 conquest is the fight now: a planet registers the garrison its setup
authors, each defender's own death counts against it, and the last one takes
the world. The capture points - stand in a ring, wait out a timer, once per
ring - are gone, along with the editor palette that placed them.
#212 conquest opens a dialog on the surface naming the research points
recovered; the award travels with the signal, after it is banked.
#209 the prologue's charted sectors go with the breach, so the map the
survivors keep is of where they now are - and "chart 30 sectors" is no
longer complete before they have flown anywhere.
#218 enemy variety is gated on the FLEET, not on wave strength: a starting
fleet meets chasers only at any wave number, and each vessel past three
opens one more kind.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019AJMdB7iuHuLFZM1aBu3GD

tests/test_planet_map_assignment.gd

@@ -145,7 +145,6 @@ func _plant_pool() -> bool:
 		setup.setup_id = pool_id
 		setup.display_name = pool_id
 		setup.surface_profile_id = "rocky"
-		setup.capture_points = PackedVector2Array([Vector2(100.0, 100.0)])
 		if ResourceSaver.save(setup, "res://PlanetSetups/%s.tres" % pool_id) != OK:
 			_remove_scratch()
 			_fail("could not plant the scratch map pool")