Fixed

• Memory leak: validation maps pinned every resource per frame — SetBindGroup copied every bound buffer/texture into encoder maps per draw call. Maps never cleared after Submit/Release, pinning BindGroup objects indefinitely. Now tracks bind groups only; validation walks boundBuffers/boundTextures transitively. Contributor: @samyfodil (#291)

• Validation error precedence — buffer/texture errors now deterministically beat bind group errors regardless of map iteration order. Matches Rust wgpu ordering.