Phase 4 play-test fixes: deep caves, fuller cave spawns, strays, shared loot

From Adrian's play-test (2026-10-30):
- The Deep Dark no longer fills the deepslate layer: world/biomes.json
  splits it by temperature (Deep Dark under cold and temperate land,
  basalt deltas under the hottest, ordinary caves between); at y -52 it
  drops from 30 % to 14 % of the land, basalt 7 %.
- Cave zones fill up to their targets with lines whose primary type fits
  the cave; top stages spawn up to the band's top (Deep Dark Lv 60, Basalt
  70); no time-of-day conditions underground.
- Wild Pokemon more than 10 levels above the band of the zone they
  wander into despawn (zone/Wanderers.kt).
- Loot is shared: all players in one scoreboard team, Lootr team_loot.
- Basalt ore nodes reach the deep basalt.
Self-tests strays_despawn and loot_is_shared; the catching rules from the
previous commit are now tested too. Template rebuilt (world check passed),
island quick check passed (36 self-tests and the restart test).
Shoulder Pokemon noted for Phase 5.

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

datapacks/core/data/cobblesurvival/zones/island.json

@@ -1 +1 @@
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+{"_comment":"Generated by tools/zone_layout.py from world/zones.json; do not edit by hand.","seed":"isle-26","radius":1700,"step":24,"size":142,"zones":[{"id":"button_isle","name":"Button Isle","levels":[2,10]},{"id":"frostpeak","name":"Frostpeak Range","levels":[40,55]},{"id":"sunscorch","name":"Sunscorch","levels":[30,45]},{"id":"mire","name":"Mangrove Mire","levels":[25,38]},{"id":"jungle","name":"Verdant Jungle","levels":[18,30]},{"id":"highlands","name":"Highland Meadows","levels":[25,35]},{"id":"westmarch","name":"Westmarch","levels":[15,25]},{"id":"southwold","name":"Southwold","levels":[8,18]},{"id":"shallows","name":"Shallows","levels":[5,20]},{"id":"deep_sea","name":"Deep Sea","levels":[30,50]}],"caves":[{"id":"lush_caves","name":"Lush Caves","levels":[12,28],"biome":"minecraft:lush_caves"},{"id":"dripstone","name":"Dripstone Depths","levels":[22,38],"biome":"minecraft:dripstone_caves"},{"id":"deep_dark","name":"Deep 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