Add moon campaign: 3 levels with spacecraft transitions

TODO.md

@@ -32,18 +32,14 @@ after ship departs (SC_DONE).
 Implemented: base speed 120→200, accel 200→350, respawn 3→6s, stagger 0-3→0-8s,
 random horizontal drift (±60 px/s), moon level reduced from 24 to 8 asteroids.
 
-## Moon campaign: 3 levels with spacecraft transitions
-Extend the moon into a 3-level sequence connected by spacecraft takeoff/landing:
-- **moon01.lvl** — Current level. Exit triggers spacecraft takeoff, transitions
-  to moon02.
-- **moon02.lvl** — Second moon level (new terrain, new hazards). Starts with
-  spacecraft landing intro. Exit triggers takeoff to moon03.
-- **moon03.lvl** — Third/final moon level. Starts with spacecraft landing.
-  Exit triggers takeoff and transitions to level01 (space station).
-- **level01.lvl** (space station roof) — Starts with spacecraft landing on the
-  station rooftop. Ship stays landed (no takeoff). First armed level.
-- Moon exit transitions require the "spacecraft at level exit" feature so
-  the ship flies in when the player approaches the exit zone.
+## ~~Moon campaign: 3 levels with spacecraft transitions~~ ✓
+Implemented: 3 moon levels connected by spacecraft takeoff/landing sequences.
+- **moon01.lvl** (1000 tiles) — Exit triggers spacecraft, transitions to moon02.
+- **moon02.lvl** (200 tiles) — Crater fields, tighter platforming. Spacecraft
+  intro, 7 asteroids, unarmed. Exit to moon03.
+- **moon03.lvl** (150 tiles) — Dark side, hardest moon terrain. Spacecraft
+  intro, 5 asteroids, unarmed until gun powerup near exit. Exit to level01.
+- **level01.lvl** — Space station with spacecraft landing intro (arriving from moon).
 
 ## Level generator: height zones (verticality)
 Add vertical variety to generated levels using a "height zones" approach: