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>

docs/design.md

@@ -265,15 +265,30 @@ Self-tests (`MachineTests`): in and out, wrong Pokémon refused, broken shell an
 
 ## Phase 7: boss battles with area attacks (Adrian, 2026-11-02)
 
-Adrian's choices: every zone guardian gets area attacks (more and harder in harder zones); the Basalt Furnace's boss is **Groudon**; **Giratina** replaces the Ender Dragon; dying or leaving the arena loses the fight; area attacks hit only the player (the roadmap's default).
+Adrian's choices: every zone guardian gets area attacks (more and harder in harder zones); the Basalt Furnace gets a boss and the End a Pokémon that replaces the Ender Dragon; dying or leaving the arena loses the fight; area attacks hit only the player (the roadmap's default).
+
+**Guardians reviewed** (Adrian, 2026-11-02: the Deep Dark should have a legendary, and each guardian should fit its zone; Tyranitar in the snow looked off). Adrian's first picks, Groudon (Basalt), Giratina (End) and Meloetta (Deep Dark), have no model in Cobblemon 1.8.4 (only 17 legendaries and 2 mythicals are implemented), so implemented ones stand in until they come; changing one is a word in `world/zones.json`:
+
+| Zone | Was | Now | Why |
+| --- | --- | --- | --- |
+| Highland Meadows | Cinderace | **Mudsdale** | a draft horse of highland pastures, not a starter |
+| Sunscorch | Delphox | **Flygon** | the desert spirit of sandstorms |
+| Frostpeak Range | Tyranitar | **Abomasnow** | lives on snowy mountains; spawns there |
+| Deep Dark | Crobat | **Regigigas** (normal size) | a legendary; the ancient colossus sleeping in ruins, like the Ancient Cities |
+| Basalt Furnace | none | **Moltres** (Lv 75) | the flame bird of the volcano; stands in for Groudon |
+| The End | Ender Dragon | **Eternatus** | the cosmic final boss; stands in for Giratina |
+
+The others fit and stay: Morpeko (Button Isle), Pinsir (Southwold), Scyther (Westmarch), Tangrowth (Jungle), Swampert (Mire), Kingdra (Deep Sea).
 
 **Bosses are data**, `datapacks/core/data/cobblesurvival/bosses/<id>.json`, written by `tools/zone_bosses.py` from a tier table per zone band: which fight it is (a zone's guardian, or the End boss), the arena radius, and the attack patterns. A pattern has a shape (circle, ring, line, cone) and its size, where it's aimed (at the player, or around the boss), a telegraph time, damage, an optional effect (fire: set alight; ice: slowed and freezing) and a trigger (every so many seconds, every so many turns, or once when the boss's HP falls below a share).
 
 **Runtime** (companion mod). A battle between players and a boss Pokémon becomes a boss fight. While it lasts, due patterns telegraph with particles on the ground where they'll land, then hit the battling players standing inside; everything stops when the battle ends. The arena is a circle around where the boss stood when the fight began: a player who leaves it, or dies, loses the fight (the battle ends, the boss stays, nothing drops). Cobblemon's own flee check only applies when a battle starts, which is why the arena is enforced here.
 
-**Groudon** becomes the Basalt Furnace's guardian like the others (Lv 75, band top + 5), with the zone's placeholder drops.
+**Moltres** becomes the Basalt Furnace's guardian like the others (Lv 75, band top + 5), with placeholder drops (3 Exp. Candy XL, 2 netherite scrap).
 
-**Giratina** replaces the Ender Dragon: the dragon no longer spawns; Giratina (uncatchable, Lv 80) appears on the main End island while a player is there, and beating it does what killing the dragon did (exit portal, gateways, the egg on the first win).
+Self-tests (`BossTests`): every guardian has a fight and a Cobblemon model; each attack shape hits a player standing in it and misses one ten blocks away; attacks stop when the battle ends; leaving the arena ends the battle and the boss heals; the dragon can't join the End, Eternatus appears, and beating it opens the exit portal with the egg.
+
+**Eternatus** replaces the Ender Dragon: the dragon no longer spawns; Eternatus (uncatchable, Lv 80, scaled down to fit) appears on the main End island while a player is there, and beating it does what killing the dragon did (exit portal, gateways, the egg on the first win).
 
 ## Open decisions for Adrian (proceeding with the default, flagged)