Every surviving carrier now owns its artifacts: checked mkdir/mkdtemp/
fopen acquisition, one all-exit cleanup funnel per carrier, ENOENT-
tolerant checked unlinks, exact-path deletion (rm -rf only for an
owned pid-keyed dir or a .sepwork beneath one), and cleanup failure
fails a passing carrier without overwriting its diagnostic. In the
same pass the carriers adapt to the driver contract this branch lands:
--sep and WW_PKGCACHE are gone, -S and the /tmp/ww_run_<pid> scratch
contract are asserted, and rows whose runtime or reject coverage moved
to test/wcc/data fixtures or test/lang @test owners are trimmed to the
byte/artifact/diagnostic observations only they can make.
Repair and adaptation ride together because most files interleave both
in the same hunks; splitting would manufacture intermediate carrier
states that never existed and cannot run against either driver.
After the frontend consolidated into one syntax package, the wcc backend
imports syntax and calls its exported fns — whose signatures reference
types that were unexported. Producing syntax's .wwi interface re-triggered
check_exported_type ("exported declaration references unexported type"):
the residual of BUG-A at the one surviving syntax->wcc boundary. Export
the 16 types that appear in syntax's wcc-facing public surface (directly
in an exported signature, or via a recursively-referenced exported struct
field): nkind, node, lex, tok, tkind, parser, scope, sym, skind, tinfo,
tykind, tfield, tparam, ttupleelem, tctx, tinfocacheent. The set is
minimal (unexporting any one re-breaks the producer) and complete; pos
stays internal. Pure source change — exporting a type emits no code, so
the bootstrap binaries are byte-identical (verified against a clean base
build); only syntax's .wwi gains the type decls.
Post-frontend-reorg residual (#74). syntax now sep-produces clean both
stages. The separate concern of wcc's currently-unqualified refs to
syntax symbols (#75) is a distinct follow-up. Gate 989_syntaxexport_run.
