Hojun-Cho
fd45aedf6c
`type oserror = i64` carries -errno (Hare's errors::errno-shaped named-i64). The three convenience wrappers move off the i64 = -1 sentinel and onto the tagged-union surface. Callers updated across the selfhost (wwdump, w6c, w6a, w6l, ww driver). The slurp paths in w6c/w6a/w6l/wwdump now match on the filesize and readall results; the ELF-emitting writeall sites in w6a/obj.ww are wrapped through two small local helpers (`wrn` for "wrote N bytes ok?", `wrdrop` for fire-and-forget) so the existing 11-callsite write loop stays readable. selfhost/test/smoke.ww kept using raw os.read instead of os.readall: the 990 cgen-match probe compiles smoke.ww standalone (no `use` expansion), and cross-module type references like `os.oserror` can't be resolved in that mode. Two selfhost-side gaps surfaced and got plugged: - lib/ww/parse/parse.ww parsetype now collapses dotted type names (`pkg.Type` → single N_TNAME with the joined string), mirroring C parsetype's dotted-path loop. Local `joindotted` helper because there's no arena-based string-concat in the selfhost lib yet. - selfhost/cmd/wcc/check.ww name-resolver applies the dotted-prefix rule from cmd/wcc/check.c's resolve_typename: split at the last dot, look up the head as a `use` import, then the leaf as a type.