Clean repo for open source release

Remove build artifacts, dev tool configs, unused dependencies,
and third-party source dumps. Add proper README, update .gitignore,
clean up Makefile.

src/main/java/com/tiedup/remake/mixin/client/MixinCamera.java

@@ -0,0 +1,81 @@
+package com.tiedup.remake.mixin.client;
+
+import com.tiedup.remake.items.base.ItemBind;
+import com.tiedup.remake.v2.BodyRegionV2;
+import com.tiedup.remake.items.base.PoseType;
+import com.tiedup.remake.state.HumanChairHelper;
+import com.tiedup.remake.state.PlayerBindState;
+import net.minecraft.client.Camera;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.BlockGetter;
+import net.minecraft.world.phys.Vec3;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+/**
+ * Mixin for Camera to lower first-person view when in DOG pose.
+ *
+ * In DOG pose, the player model is horizontal (like a dog), so the camera
+ * should be lowered to match the eye level being closer to the ground.
+ * Normal eye height is ~1.62 blocks, we lower it by ~0.6 blocks.
+ */
+@Mixin(Camera.class)
+public abstract class MixinCamera {
+
+    @Shadow
+    private Vec3 position;
+
+    @Shadow
+    protected abstract void setPosition(Vec3 pos);
+
+    @Inject(method = "setup", at = @At("TAIL"))
+    private void tiedup$lowerCameraForDogPose(
+        BlockGetter level,
+        Entity entity,
+        boolean detached,
+        boolean thirdPersonReverse,
+        float partialTick,
+        CallbackInfo ci
+    ) {
+        // Only affect first-person view
+        if (detached) {
+            return;
+        }
+
+        if (!(entity instanceof Player player)) {
+            return;
+        }
+
+        PlayerBindState state = PlayerBindState.getInstance(player);
+        if (state == null) {
+            return;
+        }
+
+        ItemStack bind = state.getEquipment(BodyRegionV2.ARMS);
+        if (bind.isEmpty() || !(bind.getItem() instanceof ItemBind itemBind)) {
+            return;
+        }
+
+        if (itemBind.getPoseType() != PoseType.DOG) {
+            return;
+        }
+
+        // Lower camera by 0.6 blocks to match the horizontal body position
+        // Normal eye height is ~1.62, DOG pose should be around ~1.0
+        setPosition(position.add(0, -0.6, 0));
+
+        // Human chair: move camera forward into the head
+        if (HumanChairHelper.isActive(bind)) {
+            float facing = HumanChairHelper.getFacing(bind);
+            float facingRad = (float) Math.toRadians(facing);
+            double fwdX = -Math.sin(facingRad) * 0.6;
+            double fwdZ = Math.cos(facingRad) * 0.6;
+            setPosition(position.add(fwdX, 0, fwdZ));
+        }
+    }
+}