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>

world/zones.json

@@ -1,9 +1,10 @@
 {
-  "_comment": "Zone plan for Phase 3 (model approved by Adrian 2026-10-29; levels are placeholders, see docs/balance.md). tools/zone_layout.py assigns each surface cell of the island to the first zone whose rule matches, in this order, and renders build/zone-map.png. Rules: 'within' = distance from 0,0 in blocks; 'biomes' = cells of these biomes, clusters smaller than min_cells dropped, plus 'absorb' = cells of other biomes within that many blocks of the cluster; 'region' = what is left, by half-plane (x/z bounds in blocks); 'water' = sea cells of these biomes. Biomes in 'inherit' (rivers) take the zone of the land around them. Cave zones follow the cave biome everywhere under the island and are not drawn. 'lines' = how many evolution lines tools/zone_spawns.py aims to give the zone (scaled to the lines available); 'species' pins a line to a zone by hand. 'guardian': the zone's Alpha guardian (tools/zone_spawns.py picks the strongest Pokémon spawning in the zone unless 'species' is given, at the band's top level + 5) and its drops, which help with the next zone; it stands at the zone's sample point and returns guardian_respawn_hours after it is beaten (Adrian, 2026-10-29: fixed spots, 5 hours). 'ores': Phase 4 ore tiers (tools/zone_ores.py writes Regenerating Ore Veins' config and the companion mod's node table from them). Each tier lives in exactly one zone, higher tiers in higher zones; Cobblemon's evolution stones are tiers too. Adrian (2026-10-30): small nodes on the surface, larger veins underground that are harder to find, and the cave zones' ores as nodes on the cave floor, not in the walls. 'nodes': 'chance' per chunk, 'radius' in blocks (0 = one block); cave tiers also 'tries' (columns searched per chunk) and 'y' (where their cave biome lies). 'veins' (surface tiers only, underground): 'radius', 'y', 'spacing' in chunks between candidate chunks, 'attempts'; 'stone'/'deepslate' split them into an upper vein (y >= 0) and a lower one, 'blocks' is a weighted list. 'regen_minutes' of real time, plus 'jitter', 'fill' (veins) and 'node_fill' (nodes bigger than one block) from 'ore_defaults'. 'level_pressure': a Pokémon more than grace_levels above the band of the zone its trainer stands in gets per_level less experience per extra level, down to minimum (Exp. Candy and commands excepted).",
+  "_comment": "Zone plan for Phase 3 (model approved by Adrian 2026-10-29; levels are placeholders, see docs/balance.md). tools/zone_layout.py assigns each surface cell of the island to the first zone whose rule matches, in this order, and renders build/zone-map.png. Rules: 'within' = distance from 0,0 in blocks; 'biomes' = cells of these biomes, clusters smaller than min_cells dropped, plus 'absorb' = cells of other biomes within that many blocks of the cluster; 'region' = what is left, by half-plane (x/z bounds in blocks); 'water' = sea cells of these biomes. Biomes in 'inherit' (rivers) take the zone of the land around them. Cave zones follow the cave biome everywhere under the island and are not drawn. 'lines' = how many evolution lines tools/zone_spawns.py aims to give the zone (scaled to the lines available); 'species' pins a line to a zone by hand. 'guardian': the zone's Alpha guardian (tools/zone_spawns.py picks the strongest Pokémon spawning in the zone unless 'species' is given, at the band's top level + 5) and its drops, which help with the next zone; it stands at the zone's sample point and returns guardian_respawn_hours after it is beaten (Adrian, 2026-10-29: fixed spots, 5 hours). 'ores': Phase 4 ore tiers (tools/zone_ores.py writes Regenerating Ore Veins' config and the companion mod's node table from them). Each tier lives in exactly one zone, higher tiers in higher zones; Cobblemon's evolution stones are tiers too. Adrian (2026-10-30): small nodes on the surface, larger veins underground that are harder to find, and the cave zones' ores as nodes on the cave floor, not in the walls. 'nodes': 'chance' per chunk, 'radius' in blocks (0 = one block); cave tiers also 'tries' (columns searched per chunk) and 'y' (where their cave biome lies). 'veins' (surface tiers only, underground): 'radius', 'y', 'spacing' in chunks between candidate chunks, 'attempts'; 'stone'/'deepslate' split them into an upper vein (y >= 0) and a lower one, 'blocks' is a weighted list. 'regen_minutes' of real time, plus 'jitter', 'fill' (veins) and 'node_fill' (nodes bigger than one block) from 'ore_defaults'. 'wanderers': a wild Pokémon more than 'grace_levels' above the band of the zone it stands in despawns (Adrian, 2026-10-30: a Lv 61 from the Basalt Furnace turned up in the Lush Caves); not in battles, not while angry at someone, never a guardian. 'level_pressure': a Pokémon more than grace_levels above the band of the zone its trainer stands in gets per_level less experience per extra level, down to minimum (Exp. Candy and commands excepted).",
   "min_cells": 6,
   "inherit": ["minecraft:river"],
   "guardian_respawn_hours": 5,
   "level_pressure": {"grace_levels": 5, "per_level": 0.1, "minimum": 0.1},
+  "wanderers": {"grace_levels": 10},
   "ore_defaults": {"fill": 0.7, "node_fill": 0.8, "attempts": 1, "jitter": 0.1},
   "ores": {
     "coal": {"zone": "button_isle", "stone": "minecraft:coal_ore", "deepslate": "minecraft:deepslate_coal_ore", "regen_minutes": 20, "nodes": {"chance": 0.5, "radius": [0, 1]}, "veins": {"radius": [2, 4], "y": [-32, 100], "spacing": 6, "attempts": 2}},
@@ -15,8 +16,8 @@
     "emerald": {"zone": "frostpeak", "stone": "minecraft:emerald_ore", "deepslate": "minecraft:deepslate_emerald_ore", "regen_minutes": 75, "nodes": {"chance": 0.15, "radius": [0, 1]}, "veins": {"radius": [1, 2], "y": [-16, 320], "spacing": 8, "attempts": 2}},
     "amethyst": {"zone": "dripstone", "blocks": [["minecraft:amethyst_block", 3], ["minecraft:budding_amethyst", 1]], "regen_minutes": 120, "nodes": {"chance": 0.5, "tries": 8, "radius": [1, 1], "y": [0, 40]}},
     "diamond": {"zone": "deep_dark", "deepslate": "minecraft:deepslate_diamond_ore", "regen_minutes": 90, "nodes": {"chance": 0.15, "tries": 8, "radius": [1, 1], "y": [-64, -24]}},
-    "quartz": {"zone": "basalt", "blocks": [["minecraft:nether_quartz_ore", 1]], "regen_minutes": 60, "nodes": {"chance": 0.5, "tries": 8, "radius": [1, 1], "y": [0, 40]}},
-    "netherite": {"zone": "basalt", "blocks": [["minecraft:ancient_debris", 1]], "regen_minutes": 180, "nodes": {"chance": 0.06, "tries": 8, "radius": [0, 0], "y": [0, 40]}},
+    "quartz": {"zone": "basalt", "blocks": [["minecraft:nether_quartz_ore", 1]], "regen_minutes": 60, "nodes": {"chance": 0.5, "tries": 8, "radius": [1, 1], "y": [-64, 40]}},
+    "netherite": {"zone": "basalt", "blocks": [["minecraft:ancient_debris", 1]], "regen_minutes": 180, "nodes": {"chance": 0.06, "tries": 8, "radius": [0, 0], "y": [-64, 40]}},
     "thunder_stone": {"zone": "westmarch", "stone": "cobblemon:thunder_stone_ore", "deepslate": "cobblemon:deepslate_thunder_stone_ore", "regen_minutes": 60, "nodes": {"chance": 0.03, "radius": [0, 0]}, "veins": {"radius": [1, 2], "y": [-48, 100], "spacing": 11, "attempts": 1}},
     "shiny_stone": {"zone": "lush_caves", "stone": "cobblemon:shiny_stone_ore", "deepslate": "cobblemon:deepslate_shiny_stone_ore", "regen_minutes": 60, "nodes": {"chance": 0.15, "tries": 8, "radius": [0, 1], "y": [-16, 40]}},
     "leaf_stone": {"zone": "jungle", "stone": "cobblemon:leaf_stone_ore", "deepslate": "cobblemon:deepslate_leaf_stone_ore", "regen_minutes": 60, "nodes": {"chance": 0.04, "radius": [0, 0]}, "veins": {"radius": [1, 2], "y": [-48, 100], "spacing": 11, "attempts": 1}},
@@ -75,6 +76,6 @@
     {"id": "lush_caves", "types": ["grass", "bug", "fairy", "poison", "water"], "lines": 20, "name": "Lush Caves", "biome": "minecraft:lush_caves", "levels": [12, 28], "hazard": "none"},
     {"id": "dripstone", "types": ["rock", "ground", "steel", "fairy", "psychic", "dragon"], "lines": 20, "name": "Dripstone Depths", "biome": "minecraft:dripstone_caves", "levels": [22, 38], "hazard": "none"},
     {"id": "deep_dark", "types": ["ghost", "dark", "steel", "poison", "psychic", "rock"], "guardian": {"drops": [["cobblemon:icy_rock", 3], ["cobblemon:exp_candy_l", 2]]}, "lines": 20, "name": "Deep Dark", "biome": "minecraft:deep_dark", "levels": [45, 60], "hazard": "darkness (vanilla sculk; no Warden)"},
-    {"id": "basalt", "types": ["fire", "rock", "ground", "steel", "dragon", "dark"], "lines": 15, "name": "Basalt Furnace", "biome": "minecraft:basalt_deltas", "levels": [55, 70], "hazard": "heat (Cold Sweat)"}
+    {"id": "basalt", "types": ["fire", "rock", "ground", "steel", "dark"], "lines": 15, "name": "Basalt Furnace", "biome": "minecraft:basalt_deltas", "levels": [55, 70], "hazard": "heat (Cold Sweat)"}
   ]
 }