add light identity resolve to fix sparse reuse problem - #44
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Fix RTXDI direct-lighting flicker on light add/remove under sparse rendering (+ skip inactive pixel for temporal reuse) by storing a stable 64-bit light identity in the reservoir's unused data1.zw and resolving a stale lightIdx via a per-frame identity->index table. Gated to sparse rendering with inactive-pixel reuse off; all other modes keep the original path (no behavior/cost change, no reservoir growth).