Phase 9: crafted summons for the legendaries

Adrian, 2026-11-09: legendaries, mythicals, Ultra Beasts and Paradox Pokemon
come from crafted summons. 22 Sigils (Naganadel evolves from Poipole), one
item told apart by custom data, from world/summons.json through
tools/summons.py: late-game recipes in three tiers (Lv 70, 80, 90), each used
in a fitting zone. A summoned legend fights as a boss (area attacks by level
and type, arena 32, the Guardian's Ward) but can be caught; on capture it
loses every boss mark. One at a time within 96 blocks.

Quest book: a Legends chapter, one quest per Sigil (97 quests). JEI lists each
Sigil as its own item, and Island Drops says where a legend is summoned; drops
Cobblemon names but doesn't have (Ho-Oh's Sacred Ash) get no slot.

Self-tests every_implemented_pokemon_is_obtainable (spawn, fossil or Sigil for
every implemented species) and sigil_summons_a_catchable_legend. Self-tests
and the island check pass.

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

docs/checklists/phase-9.md

@@ -8,12 +8,15 @@
 
 - **Ore veins:** rarer nodes and wider vein spacing, one block larger in radius. Needs a new island: the save "Cobblemon Survival Island (new veins)" has it. Your other saves keep their old veins.
 - **Respawn block:** much fainter glass; you aim through it unless sneaking. Automated: `regenerator_lets_the_aim_through`.
+- **Legend summons:** 22 Sigils, crafted from late-game materials (search "Sigil" in JEI). Used in the zone written on one, it summons a catchable legend that fights like a boss. Automated: `every_implemented_pokemon_is_obtainable`, `sigil_summons_a_catchable_legend`. The Legends chapter in the quest book lists them.
 - **Left-out Pokémon:** 31 lines (67 species) spawn rarely in fitting zones (`docs/zone-species.md`). Automated: `spawn_pools_are_zoned`, `drop_sources_match_the_server`.
 
 ## In game (Prism instance)
 
 - [ ] In the new save, mine into an ore node or vein: the mined blocks turn into faint glass, and you can keep aiming and mining the ore behind them. Sneak and use one: its info still shows.
 - [ ] Do nodes and veins feel right: fewer, bigger? The island has 1.5–3× the old ore; tell me if that's too much.
+- [ ] Give yourself a Sigil from JEI (creative) and use it outside its zone: it refuses and says where it works. Use it in its zone: the legend appears with a sound and particles. Fight it: area attacks, at most a quarter of its HP per attack. Weaken it and catch it; afterwards it's an ordinary Pokémon in your party (no quarter-HP limit in later battles).
+- [ ] Is a Sigil the right cost, and the fight the right difficulty?
 - [ ] Spend time in Frostpeak or the Deep Sea: now and then a Beartic, Mamoswine, Empoleon or Walrein turns up. JEI's Island Drops page names the zone.
 
 ## Ask Adrian