Recon of SC0000 label_12649 shows sprite/background geometry is computed in
bytecode; the only missing native primitive is 0x208 get-texture-size. Spec:
implement 0x208 (host returns real image dims) + a faithful 800x600 blit
compositor; defer fades/chromakey/multi-surface. Headless `gfx` diagnostic as
numeric oracle; --selftest/trace parity preserved.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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