Remove native Drive rendering in favor of HTML visualization

[vcharraut]

What

• Remove the Raylib/EGL native Drive renderer, visualizer executable, bindings, assets, and render-only scripts/tests.
• Remove obsolete training-video, model-export, PufferNet, DriveNet, and INIH configuration paths.
• Remove native rendering configuration and build/link dependencies.
• Keep replay capture and HTML visualization as the supported visualization path.
• Update C test and CI targets after removing the native render test.

Why

Maintaining two visualization stacks adds obsolete code, dependencies, configuration, and CI coverage. PufferDrive now standardizes on the HTML replay visualizer.

Notes

• The Drive C extension no longer links Raylib, EGL, OpenGL, or INIH.
• Legacy evaluation configs that selected EGL now select the HTML backend.
• Verified with python setup.py build_c --inplace --force.
• Verified with make -C tests/drive test.