Phase 8: the pack's own JEI pages for every drop source

Adrian, 2026-11-02/03: every item that can drop gets a JEI page naming its
sources, alongside the Cobblemon Info add-on (which shows drops and biomes,
not zones). The companion mod's JEI plugin (jei/DropSourcesJei.kt) adds:
- Pokemon drops on the island: 794 species of lines that live on the
  island, with chances, amounts and the zones they spawn in (or where their
  line lives); spawns with their own drops (Beheeyem in the End). The Drop
  Synthesizer core is the catalyst.
- Guardians and the End boss; Sacrifice Altar tiers and specials; Rebirth
  Chamber; zone ore veins with regrow times; Cobblebase pasture finds per
  skill and zone.

JEI runs on the client, so the pages read assets/cobblesurvival/jei/
drop_sources.json inside the mod, written by tools/jei_sources.py from the
pack's files. Self-tests drop_sources_match_the_server (file vs live server:
drops, zones, own-drop spawns, guardians, End boss, altar) and
jei_pages_build (every page builds, every item exists). The ore a vein gives
moved into world/zones.json (ores -> item), shared with the quest book.
JEI's API (19.64.0.455) is a compile-only dependency from JEI's own Maven.
Self-tests and the island check pass.

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

docs/quests.yaml

@@ -21,30 +21,6 @@ book:
   title: Cobblemon Survival
   icon: cobblemon:poke_ball
 
-# What each zone's ore veins give when mined (pack/config/regenerating_ore_veins/veins.json).
-ore_items:
-  coal_node: minecraft:coal
-  copper_node: minecraft:raw_copper
-  iron_node: minecraft:raw_iron
-  redstone_node: minecraft:redstone
-  lapis_node: minecraft:lapis_lazuli
-  gold_node: minecraft:raw_gold
-  emerald_node: minecraft:emerald
-  amethyst_node: minecraft:amethyst_shard
-  diamond_node: minecraft:diamond
-  quartz_node: minecraft:quartz
-  netherite_node: minecraft:ancient_debris
-  thunder_stone_node: cobblemon:thunder_stone
-  shiny_stone_node: cobblemon:shiny_stone
-  leaf_stone_node: cobblemon:leaf_stone
-  water_stone_node: cobblemon:water_stone
-  moon_stone_node: cobblemon:moon_stone
-  sun_stone_node: cobblemon:sun_stone
-  fire_stone_node: cobblemon:fire_stone
-  ice_stone_node: cobblemon:ice_stone
-  dawn_stone_node: cobblemon:dawn_stone
-  dusk_stone_node: cobblemon:dusk_stone
-
 zone_chapter:
   - id: arrive
     title: "{zone}"