Publish Chimera GFX source

adapters/sdl2/README.md

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+# SDL2 renderer adapter boundary
+
+The compiled scaffold reports that no accelerated renderer exists and that the
+current PS5 window, VideoOut, input, and audio facilities must remain owned by
+SDL. Acceleration requests return `SAFETY_POLICY`; non-accelerated creation is
+`UNSUPPORTED` until the real adapter phase.
+
+The future renderer will translate SDL textures and presents to the stable
+`libchimera-gfx` resource lifecycle without replacing SDL's platform backends.
+The Phase-1 clear-frame sample is evidence for the existing SDL VideoOut route,
+not an accelerated renderer implementation.