Big, tough bosses; working machines show it; JEI drop pages on the roadmap

Bosses (Adrian, 2026-11-02: Eternatus too small and too easy; guardians way
bigger and tougher; only defensive stats up; no attack takes more than 25 %):
- Guardians scale to about 8 blocks tall (1.5x-12x), Eternatus to 15 blocks
  (2.5x, was 0.2x). Cave guardians look for a spot with room above them.
  Bosses already in a world grow on the next check outside battle.
- Perfect IVs and 170 EVs each in HP, Defense and Sp. Def, nothing offensive.
- The Guardian's Ward, a Showdown-only held item (held_items/guardiansward.js)
  handed to every boss by a HeldItemProvider: Defense and Sp. Def x2 while
  defending, and one attack (all hits together) takes at most 25 % of max HP.
- Area attacks that start at the boss reach half its width further.

Machines (Adrian, 2026-11-02): a working core is active: it glows, its front
animates (flickering fire on the furnace core, pulsing emblems elsewhere), and
particles show in the chamber and at the core (client side). The Pokemon
inside flinches about every 15 s (red flash, Cobblemon's hit sound, no damage).

Roadmap Phase 8: every item that can drop gets a JEI page naming its sources.

Self-tests: practice_bosses_spawn checks size and training,
boss_takes_a_quarter_per_attack runs a real battle (each Lv 100 Bullet Seed
takes exactly a quarter), heat_core_cooks_with_hoppers checks the active state
and the flinch. Self-tests and the island check pass.

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

docs/checklists/phase-7.md

@@ -10,6 +10,7 @@
 - **Boss fights:** a battle with a guardian (or the End boss) becomes a fight with area attacks: red or coloured particles on the ground show where an attack lands, about 1.5–2.5 seconds later it hits whoever stands inside. Circles, lines, cones and rings; harder zones get more of them. Fire, Ice and Poison bosses burn, freeze or poison. Automated: `boss_attack_shapes`, `boss_attacks_land_and_stop_with_the_battle`.
 - **Arena:** leaving it (24 blocks; Basalt 32; End 40) or dying ends the battle as lost; the boss heals and stays. Automated: `boss_arena_leaving_loses`.
 - **The End:** the Ender Dragon is gone; Eternatus appears on the main island, with the dragon's boss bar; beating it opens the exit portal and gateway, leaves the egg the first time and gives experience. Automated: `end_boss_replaces_the_dragon`.
+- **Big and tough bosses** (Adrian, 2026-11-02): guardians stand about 8 blocks tall, Eternatus 15. Only HP, Defense and Sp. Def are raised (training, and the Guardian's Ward in battle doubles Defense and Sp. Def); no single attack takes more than a quarter of their HP. Guardians already in your world grow on the next check. Automated: `practice_bosses_spawn`, `boss_takes_a_quarter_per_attack`.
 - **End spawns:** the End is a zone (Lv 50–70) with Cobblemon's End lines: Beheeyem, Reuniclus, Metagross; Gothitelle and Sigilyph in End cities; Malamar and Unown with a Poké Snack. Automated: `end_has_spawns`.
 
 ## In game (Prism instance)
@@ -22,6 +23,8 @@ On the island save (or a new one), in creative or survival:
 - [ ] Leave the End and come back without beating Eternatus: still only one (fixed 2026-11-02).
 - [ ] Go to the End: no dragon; Eternatus stands south of the portal, the boss bar shows its HP. Beat it: the exit portal opens, the egg appears.
 - [ ] Find Regigigas in a Deep Dark cave and Moltres in the Basalt Furnace.
+- [ ] Go to the End: Eternatus is huge now (15 blocks). Fight it: no attack takes more than a quarter of its HP bar, even a super-effective one; it needs at least four hits. Its attacks are as strong as before.
+- [ ] Visit a guardian (`/cobblesurvival boss <zone>` spawns a practice copy next to you): about 8 blocks tall; Regigigas and Moltres stand in caves with room above them.
 - [ ] Walk around the End's islands for a minute: Beheeyem, Reuniclus and now and then Metagross appear, Lv 50–70 (`/cobblesurvival zone` shows "The End").
 
 ## Ask Adrian