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- fs.rs: node-table VFS (root /dev /tmp /etc). Regular files are
in-memory ramfs; char devices regenerate content on every read so
'cat /dev/rtc' shows the live time. Nodes are stable handles with
tombstone removal; . and .. path resolution.
- /dev devices: mem (raw physical RAM, offset = address), rtc, pci,
version, meminfo, null, zero, console (write prints to screen+serial),
serial. /etc/motd static file.
- shell: ls, cat, hexdump (hexdump -C style), mkdir, touch, rm; echo
gains '>' overwrite and '>>' append redirection (append bug fixed:
first '>' in '>>' was parsed as overwrite)
- boot: fs init + self-test (create/read/write/remove) before the shell
- QEMU verified: file lifecycle, redirection, console/null writes,
mkdir/touch/rm, hexdump /dev/mem and /tmp/x byte-exact
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