Blockhaven: zombies and skeletons on Java's models, and a pack built from your own game

[k1519035]

This is the first batch of mobs on Java 1.20.1's own models, plus a way to test with the official textures without committing them.

Builds on #68 (Java's player model and java unwrap). Until #68 merges, this PR also shows its commits; only the last commit is new.

Undead (zombie, husk, drowned, skeleton, stray, wither skeleton)

• Meshes and texture layouts: Java's exact meshes (ZombieModel, DrownedModel, SkeletonModel), via a new mobHumanoid() in entity/humanoid.js.
  • Zombies mirror their left limbs.
  • The drowned has its own left arm and leg.
  • Skeletons have 2-px limbs with legs 2 px out.
  • 64×32 textures fill the top half of a layer.
• Poses: HumanoidModel.setupAnim plus each mob's own arms.
  • animateZombieArms: held out, higher while hunting, chopping on a hit.
  • The skeleton aims its bow along its gaze, or reaches with both arms when fighting without one.
  • The drowned raises its trident to throw.
  • Arm bob.
  • Armor and held items follow the new pivots.
• Painted skins: the existing procedural skins are painted into Java's layouts.
• Pack textures: each model names its pack image (entity/zombie/zombie, entity/skeleton/stray, ...), so a resource pack's textures/entity replaces the paint (readEntityTexture, scaled to 64 wide for HD packs).
• Outer layers: the stray's clothing (StrayClothingLayer, 0.25 px out) and the drowned's outer layer (DrownedOuterLayer) are drawn as Java does. They're clear unless the pack supplies them.
• Size: husks are drawn 1.0625× as in Java.

Official textures without committing them: tools/pack-from-jar.mjs

• node docs/games/blockhaven/tools/pack-from-jar.mjs builds ~/Downloads/blockhaven-vanilla-1.20.1.zip from the player's own installed client jar. It looks in the Minecraft launcher, the Modrinth App, Prism Launcher and CurseForge, and otherwise downloads the client from Mojang the way the launcher does.
• The zip contains assets/minecraft/textures and a pack.mcmeta.
• Load it on any build (including the deployed site) with Options › Resource Packs.... It stays in that browser.
• Nothing from Mojang is in the repository.
• The script has no dependencies (its own zip reader and writer).

Testing

• tests/humanoid.test.mjs gains checks on the mob meshes (mirroring, the drowned's own limbs, skeleton limbs, texture names, outer layers), the zombie arm heights, and the skeleton's bow aim.
• node --test: 124 pass.
• By eye (headless Edge):
  • All six mobs, painted and with a pack built by the script from the official 1.20.1 jar (local only).
  • Poses side-on: idle and hunting zombie arms, skeleton bow, wither skeleton melee, drowned trident.
  • All six summoned in a world.

🤖 Generated with Claude Code

https://claude.ai/code/session_01R5yMmGQVzFD1XVDyZe42KG

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