Hojun-Cho fbe0df4e68 lib: add temp + os.mkdir/rmdir/EXCL ...

temp mirrors Hare's temp: file, named, dir. file() routes through
named() and discards the path (no O_TMPFILE yet). Path randomizer
uses inline SplitMix64 seeded from getpid + O_EXCL retry (Hare uses
crypto::random which we don't ship). named() takes out-pointers for
fd + path — return shape gated on tasks #5 and #11. Caller closes
and removes; no defer in ww.

os gains mkdir, rmdir, flag.EXCL — straight ports of ref/hare/os.
selfhost combined files cascade; 995_self_rebuild byte-identity
holds.

2026-05-13 17:18:59 +09:00

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