Add a log panel that captures QEMU stdout/stderr, route serial to stdio, and
pass -d guest_errors,unimp so device warnings (e.g. the m25p80 Read-ID gap that
stalls CrossPoint boot) are visible in the browser. Read the framebuffer via
HEAPU8 to match the validated node path.
Accept the ~5 MB release firmware.bin directly: place it at 0x10000 in a
0xFF-erased 16 MB image alongside the bundled ESP32-C3 bootloader (0x0) and
CrossPoint partition table (0x8000). m25p80 requires a full chip-size backing,
so the 16 MB image is still built, but the user no longer pre-merges. Full
16 MB images are still accepted as-is.
evan