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>

README.md

@@ -75,6 +75,12 @@ python3 tools/zone_spawns.py
 ```
 Writes each zone's spawn pool from Cobblemon's spawn data (every evolution line on the island gets one home zone; levels follow the zone's band) and its Alpha guardian, and lists both in `docs/zone-species.md`. Run after `tools/zone_layout.py` and the field guide; pin a line to a zone in `world/zones.json` → `species`.
 
+```bash
+python3 tools/zone_bosses.py
+```
+
+Writes the boss fights (Phase 7): every guardian's area attacks by its level's tier, and the End boss. Run after `tools/zone_spawns.py`.
+
 ```bash
 python3 tools/zone_ores.py
 ```