ww test: fork-isolated record-and-continue harness (lib/test, both stages)

lib/test/run.ww: fork+wait4 runner; each @test runs in its own child,
abort/SEGV/FPE decoded from wait-status, failures recorded and the run
continues; exit = fail count. Tests are hermetic: module globals do not
persist test-to-test (fresh fork image; sanctioned divergence from
harec's shared-process __test_main, no setjmp/signal layer needed).
-T synth (both stages) emits a module-global (str,*fn() void) table +
return run(table) instead of straight-line calls. Driver twins bundle
lib/test under test mode and gain ww test -c/-o (go test -c) so the
byte-id gates diff the same artifact the real path builds. Gates
989/910/997 rewired onto it; new 911 pins record-and-continue across
all three fault classes; 949 +3 rows. (#17-team commit-2)

test/wcc/949_driver_flagargs.c

@@ -5,9 +5,11 @@
  *   build/run  — a lone -I/-L/-l/-o (flag with no following argument) is a
  *                hard error "ww <cmd>: -X needs an argument" (rc 2), not a
  *                silently-swallowed positional.
- *   test       — only -I carries meaning; -l/-L/-o and any unknown flag are
- *                rejected with "ww test: unknown flag" (rc 2); a lone -I is
- *                "ww test: -I needs an argument" (rc 2).
+ *   test       — -I/-c/-o carry meaning; -l/-L and any unknown flag are
+ *                rejected with "ww test: unknown flag" (rc 2); a lone -I/-o
+ *                is "ww test: -X needs an argument" (rc 2); -c/-o without a
+ *                single test file is "ww test: -c/-o need a single test file"
+ *                (rc 2, #17).
  * Each row asserts the expected rc + stderr substring AND that the two
  * drivers are byte-identical (rule 10): the cstage parse_build_flags /
  * do_test must match the wwstage main.ww dobuild/dorun/dotest verbatim.
@@ -36,9 +38,14 @@ static const struct row rows[] = {
 	{ "run -o",     2, "ww run: -o needs an argument" },
 	{ "run -l",     2, "ww run: -l needs an argument" },
 	{ "test -l",    2, "ww test: unknown flag" },
-	{ "test -o x",  2, "ww test: unknown flag" },
 	{ "test -zz",   2, "ww test: unknown flag" },
 	{ "test -I",    2, "ww test: -I needs an argument" },
+	/* #17: -c (compile-only) + -o are now meaningful for `test`; a lone -o
+	 * needs an arg, and -c/-o require a single test file (not the default
+	 * "." directory enumeration). */
+	{ "test -o",    2, "ww test: -o needs an argument" },
+	{ "test -o x",  2, "ww test: -c/-o need a single test file" },
+	{ "test -c",    2, "ww test: -c/-o need a single test file" },
 };
 
 /* Run "<bin>/<drv> <args>" capturing rc + stderr text into err (NUL-