feat: bigger characters (16 sub-bodies), wider terminal viewport
- Entity: 16 sub-bodies (was 7), radius 0.7 (was 0.4), full humanoid
shape: head, shoulders, torso, arms, hips, legs, feet
- Terminal: viewport up to 250x80 (was 120x50), uses full terminal size
- Camera: uses renderer viewport dimensions instead of hardcoded values
- Physics: constraint correction clamped to 0.5 cells max, 8 substeps
(was 4), gravity 0.04 (was 0.08), collision pass after each constraint
iteration to prevent tunneling with larger bodies
- Player: move_speed 0.3, jump_force 1.2 for bigger body
- Spawn: 6 cells above surface (was 4) for taller body