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* fs: reject open()/read() on a directory (EISDIR)user2026-07-161-2/+2
* filesystem: a RAM FS (WRAMX) + ls/cat/save/rm; wc/head read filesuser2026-07-161-7/+14
* libc: option parsing (hasflag/optval); wc -l/-w/-c, head -n Nuser2026-07-161-9/+14
* tools: wc, head, and an argc/argv demo (args) + libc.c helpersuser2026-07-161-0/+20