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>

pack/config/lootr-common.toml

@@ -1,6 +1,10 @@
 # Only the values the pack changes; Lootr fills in the rest with its defaults.
 [refresh]
 	# Every loot container refills with a new roll 1 hour (72,000 ticks of game time) after it is first opened
-	# (Adrian, 2026-10-29). Loot is per player, so each player gets their own roll.
+	# (Adrian, 2026-10-29). Since 2026-10-30 the loot is shared (see [team] below), so it is one roll for everybody.
 	refresh_value = 72000
 	refresh_all = true
+
+[team]
+	#Cobblemon Survival (Adrian, 2026-10-30): loot is shared. Every player is in the team "islanders" (companion mod, world/SharedLoot.kt), so each container has one inventory for everybody.
+	team_loot = true