Radar.Spawn(transform, lifetime) clones the "Target Template", names it
"Target" and attaches a RadarTarget that self-destructs after lifetime.
RadarTarget aims each frame toward camera->target (full 3D LookRotation),
drives the point renderer's _BaseColor from a forward-bearing gradient
(ahead/side/behind depth cue lost in the flat disc projection) via a
MaterialPropertyBlock, and scales the point renderer transform by
camera->target distance.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
