Redesigned entity from solid 5x5 block to humanoid silhouette:
Shape (23 bodies, was 27):
H H H (head, 3 wide)
H H H
A T T T A (shoulders + arms, 5 wide)
A T T T A
T T T (torso, 3 wide)
L R (legs, split with gap)
L R
Per-part colors (Noita-inspired):
- Player: head=bright yellow, torso=golden, arms=amber, legs=dark gold
- Goblin: head=bright green, torso=green, arms=olive, legs=dark green
- Corpse: desaturated browns
SubBody now has color: [u8; 4] field, set by build_humanoid.
All renderers (terminal, ascii, graphics) use b.color directly.
Fire effect: flickering orange overlay on burning entities.
half_w adjusted from 3.5 to 3.0, half_h from 2.5 to 3.5
(taller shape, narrower than old block).
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