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

core/Quests.gd

@@ -10,7 +10,7 @@ extends RefCounted
 #
 #   1. Nothing here may ask for something the player cannot yet reach. The
 #      sharp edge is RESEARCH POINTS - they come only from conquering a
-#      planet (GameState.mark_point_captured), so every node with a
+#      planet (GameState.mark_garrison_enemy_destroyed), so every node with a
 #      research_points cost sits after `conquest` below. Ore-only nodes -
 #      Shipyards, Logistics - may come before it.
 #   2. A quest names ONE goal, and the brief says what it will take. Asking