The End gets Pokémon: a dimension zone with Cobblemon's End lines

Adrian, 2026-11-02: the End looked barren. The End is now a zone of its own
(Lv 50-70, world/zones.json -> dimensions; Zones.at returns it anywhere in the
End). tools/zone_spawns.py copies every line Cobblemon spawns in End biomes
into spawn_pool_world/the_end.json, on top of its island home: Beheeyem,
Reuniclus, Metagross; Gothitelle and Sigilyph in End cities; Malamar and
Unown with a Poke Snack. Cobblemon rolls the bucket before the Pokemon and
has these all uncommon or rare, so they move to the common bucket with even
line weights (Metagross a fifth).

Self-test end_has_spawns: the main island is in the_end and offers only End
spawns, some in the common bucket. Self-tests and the island check pass.

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

docs/balance.md

@@ -39,6 +39,7 @@ Every tunable lives in a config file or in this table. **Placeholder** means gue
 | Boss attacks (guardians) | by guardian level: up to Lv 20 a circle under the player; up to 35 + a line from the boss; up to 50 + a cone; up to 65 + a ring around the boss at half HP; above + a wide ring at a quarter HP. Telegraph 2.5 s at the lowest tier down to 1.5 s; damage level/6 health points (Morpeko 3, Moltres 12); circle every 7.4 s down to 5.6 s, line and cone less often; Fire types burn, Ice types freeze, Poison types poison | Placeholder | `tools/zone_bosses.py` → `datapacks/core/data/cobblesurvival/bosses/*.json` | Adrian, 2026-11-02: every guardian, harder in harder zones |
 | Boss arena | 24 blocks around where the boss stood; Basalt Furnace 32; the End 40; leaving it or dying loses the fight | Placeholder | same files, `arena` | |
 | End boss | Eternatus Lv 80, 0.2× size (its model is 20 m tall), back 5 hours after a win; 12,000 XP the first time, 500 after | Placeholder | `bosses/end.json` (`tools/zone_bosses.py` → `END`) | Stands in for Giratina, which Cobblemon 1.8.4 has no model for |
+| End spawns | the End is a zone, Lv 50–70; Cobblemon's End lines spawn there (Beheeyem, Reuniclus, Metagross; Gothitelle and Sigilyph in End cities; Malamar and Unown with a Poké Snack), all in the common bucket, each line's heaviest entry weight 10, Metagross 2 | Placeholder | `world/zones.json` → `dimensions` (`levels`, `bucket`, `line_weight`, `rare_factor`), then `tools/zone_layout.py` and `tools/zone_spawns.py` | Adrian, 2026-11-02: the End was barren; Lv 50–70 his pick |
 | Level pressure | full experience up to 5 levels above the zone's band, then 10 % less per level, at least 10 % (Exp. Candy and commands exempt) | Decided (Adrian, 2026-10-30) | `world/zones.json` → `level_pressure` | E.g. on Button Isle (up to Lv 10): Lv 15 full, Lv 20 half, Lv 24+ a tenth |
 | Strong flyer | ridable through the air with top speed ≥ 60 or top stamina ≥ 85 (Cobblemon ride stats) | Decided (Adrian, 2026-10-30) | `tools/zone_spawns.py` (`STRONG_FLYER_*`) | 29 species |
 | High zone for strong flyers | band starts at Lv 30 or more (Sunscorch, Frostpeak, Deep Sea, Deep Dark, Basalt Furnace) | Decided (Adrian, 2026-10-30) | `tools/zone_spawns.py` (`HIGH_ZONE_LEVEL`) | |