MK90/Unix 0.7 HW bootstrap hotfix

Binary: mk90_unix_v0.7_27c256.bin
Size: 32768 bytes
SHA-256: e217109ed2c2ce022e94322ee3debef5d124324a285ab56f99566fc943fd3728
Byte-sum checksum: 002420E3
16-bit whole-ROM word sum: 0000
Loader bytes: 476
Resident payload bytes: 8750

Targeted tests PASSED:
- test_native_boot_both_slots_and_rom_layout
- test_eight_kib_alias_stops_before_kernel
- test_bootloader_timeout_is_bounded
- test_ten_kib_unformatted_mount_uses_no_rom_after_smp1
- test_romtest_checks_data_between_markers_and_slot_switch
- test_assembler: 7/7
- test_tasks: 11/11

Physical hardware validation: pending.
