Phase 6: shell preview, core tooltips, machine test world, faster furnace

Adrian (2026-11-02): double the furnace speed; there must be a way in
game to see how a machine is built; a test world with the machines.

- Large Furnace speed doubled (2 + 0.08 x level + 0.02 x SpA).
- Ghost preview: placing a core, using it with an incomplete shell, or
  sneak-using it empty shows every wrong spot as a small glowing block
  display for 10 s (never saved), in the core's orientation, with a
  chat line counting what's missing.
- Core tooltips: what the machine does, what its shell is made of.
- /cobblesurvival machines showcase builds every machine three times
  (working with a Showcase-owned Pokemon, empty, bare core) with signs,
  hoppers, chests and cables; tools/make_machine_world.py makes a
  superflat creative world from it (level.dat via tools/nbtfile.py)
  and --prism installs it as "Machine Test (Phase 6)".
- Self-tests machine_preview_shows_the_shell and
  machine_showcase_builds_every_machine; docs and checklist.

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

docs/balance.md

@@ -31,7 +31,7 @@ Every tunable lives in a config file or in this table. **Placeholder** means gue
 | Breeding (Cobbreeding) | mod defaults: an egg every 8,000–14,000 ticks per breeding pasture, hatch multiplier 1.0 (about 10 min for 20 egg cycles), Masuda shiny boost ×4, no random eggs from two Dittos, no gate | Placeholder | `config/cobbreeding/main.json` (written by the mod; the pack ships none) | Adrian, 2026-10-31: breeding without a gate |
 | Machine shells | 3×3×3, core in a wall, chamber in the centre; casing: Heat bricks/mud bricks/deepslate bricks; Dynamo copper blocks; Synthesis iron/gold/diamond/netherite blocks; Altar obsidian/crying obsidian/blackstone/polished blackstone bricks; Rebirth amethyst/quartz/calcite; glass allowed at the window spots | Placeholder | `datapacks/core/data/cobblesurvival/machines/*.json`, `tags/block/*_casing.json` | Adrian, 2026-10-31 (Phase 6) |
 | Core recipes | Heat: 4 bricks, 4 iron ingots, blast furnace; Dynamo: 4 copper blocks, 4 redstone, thunder stone; Synthesis: 4 iron blocks, 2 redstone blocks, 2 hoppers, crafter; Altar: 4 obsidian, 4 gold blocks, echo shard; Rebirth: 4 amethyst blocks, 4 diamonds, shiny stone | Placeholder | `datapacks/core/data/cobblesurvival/recipe/*_core.json` | |
-| Large Furnace | furnaces heated: 1 + level/15 (max 8); cooking speed 1 + 0.04 × level + 0.01 × Special Attack (e.g. Lv 50, SpA 70: 3.7×); no fuel | Placeholder | `machines/heat_core.json` | |
+| Large Furnace | furnaces heated: 1 + level/15 (max 8); cooking speed 2 + 0.08 × level + 0.02 × Special Attack (e.g. Lv 50, SpA 70: 7.4×; doubled, Adrian 2026-11-02); no fuel | Placeholder | `machines/heat_core.json` | |
 | Generator | 50 FE/t per level × (1 + 0.005 × Special Attack) (Lv 30, SpA 50: 1,875 FE/t); stores 200,000 FE, pushes up to 16,000 FE/t | Placeholder | `machines/dynamo_core.json` | After Poke Power's 50 FE per level |
 | Drop Synthesizer | 2,000,000 FE per drop roll, takes up to 32,000 FE/t (one roll a minute at most), stores 4,000,000 FE; looting by casing tier: iron 0, gold I, diamond II, netherite III (+0–1 per drop per level; 25 % per level for a second roll); 9 output stacks | Placeholder | `machines/synthesis_core.json` | |
 | Sacrifice Altar | from Lv 20: 3 Exp. Candy S; 35: 3 M; 50: 3 L; 65: 2 XL + Ability Capsule; 80: 3 rare candies + 2 XL; 90: 5 rare candies + Ability Patch; 100: 8 rare candies + Ability Patch + nether star; Lv 100 Dragon type: + dragon egg; confirm within 5 s | Placeholder | `machines/altar_core.json` | Rare candies above the highest natural level (Lv 75 guardians) |

docs/checklists/phase-6.md

@@ -24,10 +24,15 @@ The middle of each side wall and the top centre may be glass, to see the Pokémo
 
 ## In game (Prism instance)
 
-Creative mode gives the cores in the Functional Blocks tab; each has a recipe for survival.
+**The save "Machine Test (Phase 6)"** (2026-11-02): superflat, creative, cheats on, no wild Pokémon. You start between two rows; looking north, the first row has every machine working with a Pokémon inside (they belong to a "Showcase" owner, so you can watch but not take them out): Large Furnace with a furnace and a smoker fed by hoppers, Generator cabled to the Drop Synthesizer (gold shell, hopper and chest under its core), Sacrifice Altar, Rebirth Chamber. Behind you, the same machines empty, to try with your own Pokémon (`/pokegive`); further south, the bare cores. Signs say which is which.
+
+Elsewhere, creative mode gives the cores in the Functional Blocks tab; each has a recipe for survival.
+
+- [ ] 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.
 
 - [ ] 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, and ends in the chest.
+- [ ] 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.
 - [ ] Build a Dynamo Core shell of copper with an Electric type, lay Poke Power cables from the core: sneak-use shows the energy made.
 - [ ] Put a Synthesis Core shell of gold blocks next to it (cables between), with a Pokémon inside and a hopper and chest under its core: its drops arrive in the chest. Swap the shell for diamond blocks: sneak-use shows looting 2.
 - [ ] Put a Lv 20+ Pokémon in an Altar Core shell: sneak-use shows the reward, sneak-use again within 5 seconds sacrifices it.

docs/design.md

@@ -255,6 +255,8 @@ Adrian's choices: the Large Furnace has a Fire Pokémon heat real furnaces, and
 
 **Rebirth Chamber.** A Lv 100 Pokémon put in starts a long rebirth (placeholder: two hours of server time, also while the chunk is unloaded). Then it is the first stage of its line at Lv 1 and shiny, keeps its nickname, original trainer, held item and every move it learned, gets three of its IVs set to 31 (no IV ever goes down), and keeps its ability; an Ability Patch comes with it, so taking the hidden ability is the player's choice. Taking it out before the end cancels the rebirth.
 
+**Finding out how to build one** (Adrian, 2026-11-02: there must be a way in game). Placing a core, using it while its shell is incomplete, or sneak-using it while empty shows every missing or wrong spot of the shell as a small glowing ghost block for ten seconds (vanilla block displays, so clients need nothing; never saved), in the orientation the core faces, with a chat line counting what's missing. The cores' tooltips say what each machine does and what its shell is made of. The machine test world (`tools/make_machine_world.py`) has every machine built.
+
 **Cores** are crafted (soft gates by material): Heat Core from bricks, iron and a blast furnace; Dynamo Core from copper blocks, redstone and a thunder stone; Synthesis Core from iron and redstone blocks, hoppers and a crafter; Altar Core from obsidian, gold blocks and an echo shard; Rebirth Core from amethyst blocks, diamonds and a shiny stone. Their textures are drawn by `tools/machine_assets.py`.
 
 Self-tests (`MachineTests`): in and out, wrong Pokémon refused, broken shell and broken core (to the PC when the party is full), chunk unload, server restart, and each machine's work (a furnace fed and emptied by hoppers without fuel, a Poke Power cable charged by a Dynamo Core, Magikarp's salmon through a hopper under a gold Synthesis Core, a confirmed sacrifice with a Lv 100 Dragonite's rewards, a rebirth from Charizard to a shiny Lv 1 Charmander with its moves and ability).