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>

tools/zone_layout.py

@@ -312,6 +312,7 @@ def write_datapack(zone, plan, preview):
         "seed": preview["seed"], "radius": preview["radius"], "step": preview["step"], "size": preview["size"],
         "zones": [{k: z[k] for k in keep} for z in plan["zones"]],
         "caves": [{**{k: c[k] for k in keep}, "biome": c["biome"]} for c in plan["caves"]],
+        "dimensions": [{**{k: d[k] for k in keep}, "dimension": d["dimension"]} for d in plan.get("dimensions", [])],
         "level_pressure": plan.get("level_pressure", {}),
         "wanderers": plan.get("wanderers", {}),
         "samples": samples(zone, plan, preview),