Art/anim: Drowner glowing eyes + Grindylow + Bathynaut suit-frame prefabs

EnemyDrowner: Emissive-Gloam eyes bone-parented to Head + boneEntityStrippingMode
=None (attachments ride the rig). New skinned prefabs EnemyGrindylow +
SuitFrame_Bathynaut. Pipeline run 3x -> A1 repeatability exceeded.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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