Add API design review for requiredLimits in WebGPURenderer (PR #32907)

Analyzes the leaky abstraction introduced by exposing raw WebGPU
requiredLimits in the renderer constructor and proposes alternatives,
recommending auto-requesting adapter maximum limits (matching the
existing pattern for features).

https://claude.ai/code/session_01U4qA3U9LLWtDxv78hdLSSD