Third-person foundation

Three independent modules over ordinary Lua values:

• demi.gameplay.third_person: camera-relative movement, stamina and directional rolls.
• demi.gameplay.orbit_camera: mouse/lock-on orbit and obstruction distance.
• demi.gameplay.melee: windup, active, recovery and one hit per target per swing.

Construct with Character.new(options), Orbit.new(options), and Melee.new({windup=0.8, active=0.15, recovery=1.2, reach=2.5, damage=20}). See examples/third_person_foundation/scripts/room.lua for the complete adapter. Call attack update and character input for all participants before resolving hits in the fixed tick. Check character:invulnerable() at hit resolution. These modules never translate entity transforms themselves: pass velocities to CharacterController3D.set_velocity so static collision remains authoritative.

The camera cast callback returns nearest blocking distance. A missing callback disables obstruction. Capture/release the mouse in the owning script lifecycle. The room deliberately uses procedural pose cues; production animation clips and bone-attached hit volumes still require integration. Reach/cone tests are an approximation, not mesh collision. GPU skinning and retargeting are separate work.

Run demi package test packages/sources/demi.gameplay.third_person.