'ww test' gains the istest build path (-T injection in build_one/
buildone) and do_test/dotest accept -I, mirroring do_run - both twins.
The 35 converted lib tests drop their interim bare mains (-T
synthesizes the entry from @test fns and rejects a user main); their
35 C run-drivers flip 'ww run' -> 'ww test'; 989_lib_byteid compiles
lib tests under -T (8 user-main probe fixtures stay non-T, gated on
the fixture field). Abort-on-first-failure stands until the deferred
record-and-continue harness lands with the multi-package arc.
Hare-shaped filestat introspection. New types: filestat (80B,
mirrors fs::filestat ref/hare/fs/types.ha:141), mode (31-member
enum mirroring fs::mode ref/hare/fs/types.ha:63), stat_mask (7 bits
mirroring fs::stat_mask ref/hare/fs/types.ha:129), timespec (i64+i64,
layout-compatible with future lib/time::instant).
APIs: stat / lstat / fstat (*filestat, *u8|i32) (void|oserror) over
SYS_newfstatat (nr=262). The out-param shape sidesteps the cgreturn
24B ABI cap; commented inline. exists(*u8) bool goes through the
syscall directly rather than wrapping stat()? — dodges task #22's
80B-scrutinee match-slot disagreement until that lands.
Three latent cgen workarounds in tree, all pointer'd to filed tasks:
#22: os.exists sidesteps the (void|oserror) match shape
#24: `at` enum bundles AT_FDCWD/SYMLINK_NOFOLLOW/EMPTY_PATH instead
of three top-level `def`s (negative-literal def DATA omit)
#25: kstat.mode typed as `mode` (enum) rather than u32 to skip the
redundant u32→enum cast emit
Tests: 976_stat_run, 9 rows — stat/lstat/fstat × regfile/dir/symlink
plus exists × {regfile,dir,noent}. Row 1 also pins perm-bit and
atime/mtime/ctime!=0 to catch silent kstat→filestat offset miscompiles
(kstat fields at 72/88/104).
Graduation to lib/fs when it ships is noted inline; signatures stay
rename-compatible.
