Would have caught today|s 3-brick cycle (all-fb, midlate-fb, early-fb
bricked GenBook identically). Patched SPI images had 0xFF in the
entire idbloader region because u-boot|s mkimage silently failed
to produce idbloader-spi.img when the DDR blob grew by 548 bytes.
Static-only — no emulation yet. Phase 1 of the broader test-harness
task. Phase 2 will extend ddr_emu2 to execute TPL from SPI image
with stubbed MMIO.
