- Add axfs-ng-local/ patch: expose take_extra_block_devs(), new_default()
- kernel/pseudofs: auto-mount extra block device to /sdcard at boot
- Add scripts/build-rootfs.sh: build Busybox rootfs (disk.img/disk-la.img)
- Add scripts/test-all.sh: build + run RISC-V and LoongArch tests
- Update Makefile: kernel-rv/la, rootfs targets, correct QEMU command hints
- Simplify src/init.sh: no manual mount needed
- Add RULES.md, ARCHITECTURE.md, GAP_ANALYSIS.md, TEST_SCANNING.md
- Update .gitignore: exclude .Zone.Identifier files