test: migrate Fam13 misc checker/coercion value tests to @test (#5-C6)

Final fold-2 chunk. The 12 Fam13 single-file value drivers move from
test/wcc/*_run.c into in-language @test row-tables under test/lang/:

- value rows -> test/lang/*_test.ww (12 files)
- reject rows -> runww //ww:error carriers (13, dual-stage non-vacuous)
- nullable abort rows -> runww //ww:run-exit 1 carriers (3)
- 953_globalslice_arg -> _runonly (cs!=ww checker divergence, #28)
- 788 value_not_type_neg + 953_arrlit_slice reject_assign kept as slim
  rc-only .c pins (divergent-diag dual-reject, mutation-gated); 788 #29

Coverage parity verified row-by-row vs each retired driver; advisor-
ratified carve taxonomy; two-round reviewed. Floor ratchet follows.

test/wcc/data/nullable_asrt_void_target_fail/case.ww

@@ -0,0 +1,12 @@
+//ww:run-exit 1
+// #17 (F4) carrier: a valid ptr `as void` must ABORT (exit 1) — the void
+// polarity of the type-assert. Clean twin asrt_void_target_ok carries the
+// abort-arm byte-id; this pins the runtime abort fires. From
+// 949_nullable_assert_run.c (drew: rt::abort is a real Hare guarantee).
+package main;
+export fn main() i32 = {
+	let x: int = 5;
+	let p: (*int|void) = &x;
+	let z = p as void;
+	return 7;
+};