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/zone-species.md

@@ -1,6 +1,6 @@
 # Pokémon per zone
 
-Generated by `tools/zone_spawns.py` from Cobblemon's spawn data and `world/zones.json`; do not edit by hand. Each evolution line spawns in one zone; the stages listed are the ones whose levels reach the zone's band. Pin a line to another zone in `world/zones.json` → `species`.
+Generated by `tools/zone_spawns.py` from Cobblemon's spawn data and `world/zones.json`; do not edit by hand. Each evolution line spawns in one zone of the island; the stages listed are the ones whose levels reach the zone's band. Pin a line to another zone in `world/zones.json` → `species`. The End's lines spawn there as well as in their island zone.
 
 ## Button Isle (Lv 2–10, 25 lines)
 
@@ -58,6 +58,10 @@ Bronzor (Bronzong), Carbink, Deino (Zweilous), Ditto, Duskull (Dusclops, Dusknoi
 
 Absol, Charmander (Charizard), Diglett (Dugtrio), Drilbur (Excadrill), Durant, Gligar (Gliscor), Growlithe (Arcanine), Heatmor, Houndour (Houndoom), Magby (Magmortar), Mawile, Purrloin (Liepard), Sizzlipede (Centiskorch), Slugma (Magcargo), Torkoal, Turtonator
 
+## The End (Lv 50–70, 7 lines)
+
+Beldum (Metagross), Elgyem (Beheeyem), Gothita (Gothitelle), Inkay (Malamar), Sigilyph, Solosis (Reuniclus), Unown
+
 ## Alpha guardians
 
 One per zone at its sample point, uncatchable, five levels above the band; it returns 5 hours after it is beaten. Its drops help with the next zone.