Add render_dx10.cpp (selectable as `dx10`): composes the animated pattern (background + moving bar + top-left frame-counter block) on the CPU each frame and CopyResource's it into a real D3D10 DXGI swap-chain back buffer (DX10 has no rect-clear; no shaders). Smoke-verified: `coop_mock_game dx10 2` presents frames and exits cleanly. The frame-accurate decode-through-the-hook assertion lands with the DX10 capture commit next. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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