Phase 6 done: see-through cores, faint on sacrifice and rebirth; Phase 7 design

Adrian (2026-11-02): the cores should be transparent so the Pokémon
shows; the Pokémon's death sound when a sacrifice is made or a rebirth
ends; then start the next phase (Phase 6 approved).

- Cores drawn as a solid frame around tinted glass, rendered
  translucent, no occlusion (tools/machine_assets.py).
- The shown Pokémon plays Cobblemon's faint animation and its cry
  pitched down (Cobblemon has no death sounds), vanishes after 2 s; a
  reborn Pokémon then shows in its new form. Tests check the new form.
- Phase 7 decisions (every guardian gets area attacks, Groudon for the
  Basalt Furnace, Giratina replaces the Ender Dragon, dying or leaving
  the arena loses) and design in docs/design.md; README status.

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

docs/checklists/phase-6.md

@@ -30,6 +30,8 @@ Elsewhere, creative mode gives the cores in the Functional Blocks tab; each has
 
 - [ ] Use a bare core (third row): ghost blocks show its shell for ten seconds, and chat lists what's missing. Place a new core anywhere: the same.
 - [ ] Hover a core in the inventory: the tooltip says what it does and what its shell is made of.
+- [ ] Look at a working machine from the front: the core is see-through (frame and tinted glass), the Pokémon shows behind it.
+- [ ] Sacrifice a Pokémon, or finish a rebirth: the Pokémon in the chamber faints with its cry pitched down, then disappears (a reborn one comes back in its new form).
 
 - [ ] Build a Heat Core shell of bricks with glass in a side window, send out a Fire type and use the core: the Pokémon stands in the chamber, small enough to fit, and doesn't move. **Does it look right?** (the roadmap asks you to confirm this)
 - [ ] Put a furnace against the outside of that shell, a hopper with raw iron above it and a hopper with a chest below: the iron cooks without fuel, faster with a stronger Pokémon (speed doubled on 2026-11-02: 7.4× at Lv 50), and ends in the chest.
@@ -41,5 +43,7 @@ Elsewhere, creative mode gives the cores in the Functional Blocks tab; each has
 
 ## Ask Adrian
 
+**Phase 6 approved 2026-11-02** (after the see-through cores and the faint: "After that, you can begin with the next phase"). Numbers, casings and recipes stay placeholders.
+
 - Does the Pokémon in the chamber look right (size, place, facing out through the core's side)?
 - All numbers, casings and recipes are placeholders (`docs/balance.md`).

docs/design.md

@@ -245,7 +245,7 @@ Adrian's choices: the Large Furnace has a Fire Pokémon heat real furnaces, and
 
 **A Pokémon goes in** when its owner sends it out near the core and uses the core with an empty hand: the nearest of their sent-out Pokémon that fits walks in (it leaves the party and its data is kept in the core). Using the core again takes it out, back to the party or else the PC. Sneak-use shows the machine's state. Breaking the core or any part of the shell sends the Pokémon back to its owner, online or not. The core is the only place the Pokémon exists while inside, so nothing can be duplicated by breaking and inserting at once.
 
-**What's shown** is a real Cobblemon Pokémon entity, a copy, standing in the chamber: scaled to fit, no AI, invulnerable, silent, uncatchable, and it can't be battled or used. It's never kept in the world save: one loaded from disk is dropped, and the core puts a fresh one there.
+**What's shown** is a real Cobblemon Pokémon entity, a copy, standing in the chamber: scaled to fit, no AI, invulnerable, silent, uncatchable, and it can't be battled or used. It's never kept in the world save: one loaded from disk is dropped, and the core puts a fresh one there. The cores are see-through (Adrian, 2026-11-02): a solid frame around tinted glass, rendered translucent, so the Pokémon shows through the core as well as through glass windows. When a sacrifice is made or a rebirth ends, the shown Pokémon plays Cobblemon's faint animation and its cry pitched down (Cobblemon has no separate death sounds; the games pitch the cry down when a Pokémon faints), and vanishes two seconds later; a reborn Pokémon then appears in its new form.
 
 **Large Furnace.** Furnaces, blast furnaces and smokers (`#cobblesurvival:machine_furnaces`) standing against the outside of the shell burn without fuel while they have something to cook, and cook faster. They stay ordinary vanilla blocks, so their screens, recipes and hoppers work as always (input from above, output from below). How many are heated and how fast depend on the Pokémon's level and Special Attack (numbers in the data file and `docs/balance.md`).
 
@@ -263,6 +263,18 @@ Self-tests (`MachineTests`): in and out, wrong Pokémon refused, broken shell an
 
 **Generator.** The Dynamo Core stores Forge Energy and pushes it to whatever touches the core and takes energy (cables, machines from other mods); its output per tick depends on the Pokémon's level and Special Attack, in line with Poke Power's 50 FE per level.
 
+## Phase 7: boss battles with area attacks (Adrian, 2026-11-02)
+
+Adrian's choices: every zone guardian gets area attacks (more and harder in harder zones); the Basalt Furnace's boss is **Groudon**; **Giratina** replaces the Ender Dragon; dying or leaving the arena loses the fight; area attacks hit only the player (the roadmap's default).
+
+**Bosses are data**, `datapacks/core/data/cobblesurvival/bosses/<id>.json`, written by `tools/zone_bosses.py` from a tier table per zone band: which fight it is (a zone's guardian, or the End boss), the arena radius, and the attack patterns. A pattern has a shape (circle, ring, line, cone) and its size, where it's aimed (at the player, or around the boss), a telegraph time, damage, an optional effect (fire: set alight; ice: slowed and freezing) and a trigger (every so many seconds, every so many turns, or once when the boss's HP falls below a share).
+
+**Runtime** (companion mod). A battle between players and a boss Pokémon becomes a boss fight. While it lasts, due patterns telegraph with particles on the ground where they'll land, then hit the battling players standing inside; everything stops when the battle ends. The arena is a circle around where the boss stood when the fight began: a player who leaves it, or dies, loses the fight (the battle ends, the boss stays, nothing drops). Cobblemon's own flee check only applies when a battle starts, which is why the arena is enforced here.
+
+**Groudon** becomes the Basalt Furnace's guardian like the others (Lv 75, band top + 5), with the zone's placeholder drops.
+
+**Giratina** replaces the Ender Dragon: the dragon no longer spawns; Giratina (uncatchable, Lv 80) appears on the main End island while a player is there, and beating it does what killing the dragon did (exit portal, gateways, the egg on the first win).
+
 ## Open decisions for Adrian (proceeding with the default, flagged)
 
 | Decision | Default used for now |