fix(BgfxRenderer): Implement CommandBuffer execution and topological sort
- Add executeCommandBuffer() to IRHIDevice interface
- Implement full command buffer execution in BgfxDevice (175 lines)
- Handles SetState, SetTexture, SetUniform, SetScissor
- Handles SetVertexBuffer, SetIndexBuffer, SetInstanceBuffer
- Handles Draw, DrawIndexed, DrawInstanced, Submit
- Rewrite RenderGraph::compile() with Kahn's algorithm for topological sort
- Now respects pass dependencies correctly
- Uses sortOrder as secondary key via priority queue
- Detects cycles and throws exception
- Call device.executeCommandBuffer() in RenderGraph::execute()
- Make OpenSSL optional with std::hash fallback for SHA256
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Co-Authored-By: Claude <noreply@anthropic.com>
StillHammer
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