Phase 7: boss fights with area attacks, guardians reviewed, End boss

Adrian (2026-11-02): every zone guardian gets area attacks (harder in
harder zones); a boss for the Basalt Furnace; a Pokémon replaces the
Ender Dragon; dying or leaving the arena loses; the Deep Dark gets a
legendary and every guardian should fit its zone. Groudon, Giratina and
Meloetta have no model in Cobblemon 1.8.4: Moltres, Eternatus and
Regigigas stand in.

- Guardians: Mudsdale, Flygon, Abomasnow, Regigigas (normal size), new
  Moltres for the Basalt Furnace; zone_spawns.py takes a guardian
  "scale".
- tools/zone_bosses.py writes bosses/<zone>.json and end.json from a
  tier table (circle, line, cone, rings; telegraph, damage, triggers,
  fire/ice/poison effects, arena).
- boss/: BossFights runs patterns during a guardian or End boss battle
  (particle telegraphs, hits players inside, stops on battle end),
  enforces the arena and death as a loss (battle ends, boss heals);
  EndBoss keeps the dragon out (allowlist emptied), spawns Eternatus on
  the main island with the dragon's boss bar, and on defeat opens the
  exit portal, gateway and egg via the vanilla dragon fight, plus XP.
- Self-tests: coverage (incl. Cobblemon models), shapes, landing and
  stopping, arena loss, End boss. Docs, balance, Phase 7 checklist.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/zone_spawns.py

@@ -30,7 +30,7 @@ datapacks/core/data/cobblesurvival/spawn_pool_world/<zone>.json:
      of day, excluded biomes and the "natural" ground preset are dropped (there's no sky or day underground).
   5. Strong flyers (STRONG_FLYER_*) only spawn in zones whose band starts at HIGH_ZONE_LEVEL or more.
   6. Each zone with a "guardian" gets datapacks/core/data/cobblesurvival/guardians/<zone>.json: the
-     strongest Pokémon spawning in the zone (or "species"), uncatchable, half again as big, five levels
+     strongest Pokémon spawning in the zone (or "species"), uncatchable, half again as big (or "scale"), five levels
      above the band, with the zone's boss drops and world/zones.json → guardian_respawn_hours.
 
 Also writes docs/zone-species.md, the list per zone for review.
@@ -339,7 +339,7 @@ def main():
             "_comment": "Generated by tools/zone_spawns.py from world/zones.json; do not edit by hand.",
             "zone": zid,
             "pokemon": f"{species_name} level={level} uncatchable=yes",
-            "scale": GUARDIAN_SCALE,
+            "scale": config.get("scale", GUARDIAN_SCALE),
             "drops": [{"item": item, "count": count} for item, count in config["drops"]],
             "respawn_hours": plan["guardian_respawn_hours"],
         }, indent=1) + "\n")