memory: UEFI reaches userspace, and the ISO grows a hierarchy

Records the four bugs between "boots to cpu0: starting" and "boots to an
interactive shell", the new ioremap rule for device registers, and what
the disc now contains -- including that it is still not a live CD, and
what that would take.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.claude/memory/MEMORY.md

@@ -7,7 +7,8 @@
 - [Trusting bootcheck](schos-bootcheck-trust.md) - it silently stopped running; count the [ok] lines, never just grep FAIL.
 - [schinit](schos-schinit.md) - process 1 is launchd-shaped; job manifests, and why setsid() cost the shell its terminal.
 - [BIOS/UEFI split](schos-boot-split.md) - boot/bios and boot/uefi, and the hand-off contract a second loader must satisfy.
-- [UEFI loader](schos-uefi-loader.md) - it boots under OVMF; the SCH64 entry, the GDT trap, and the open e820 fragmentation bug.
+- [UEFI loader](schos-uefi-loader.md) - it boots to an interactive shell now; the SCH64 entry, the GDT trap, and the four bugs that stood in the way.
+- [ioremap and BARs](schunix-ioremap-and-bars.md) - never P2V a BAR; firmware puts 64-bit BARs far above the direct map.
 - [Schunix build environment](schunix-build-environment.md) — builds natively on Windows with clang/lld + mingw + Git Bash; WSL is gone, and the five latent bugs the move exposed.
 - [Syscalls: one table](schunix-syscall-single-table.md) — declare in kernel/sys/table.inc only; linux_abi.c is generated, never hand-edited.
 - [Linux ABI decision](schunix-linux-abi-decision.md) — the native syscall ABI is being dropped; Linux numbering becomes the only ABI.