test: migrate Fam4 static-init/DATA-emit value tests to @test (#30)

Continues the test-arch tower past Fam8-13. 11 module-level static-init
/ DATA-emit value drivers move from test/wcc/*_run.c into @test row-
tables under test/lang/; every classification empirically re-probed at
HEAD (refuting two stale worklist tags).

- value rows -> test/lang/*_test.ww (11 files)
- reject rows -> runww //ww:error carriers (3, dual-stage non-vacuous;
  947 const-divzero confirmed a both-stage compile-reject, not run-exit)
- 840_zeroinit, 944_array_zeroinit, 989_arrlit_tail_zero kept as byte-id
  .c pins (zero-over-dirtied-frame / DATAW-length is byte-id-blind to a
  runtime @test; #263), mutation-gated
- repoint two stale comment refs to deleted test names (719,
  989_structlocal_frame)

Migrated static-init @test ride the cs==ww T2 byte-id gate, preserving
DATA-emit byte-id. 2D global-struct array-field read (#137/#150)
confirmed cs==ww + correct at HEAD. Coverage parity verified row-by-row;
two-round reviewed. Floor ratchet follows.

test/wcc/989_structlocal_frame.c

@@ -25,9 +25,9 @@
  * 683 asm_byte_identical pattern). Byte-identity subsumes the frame:
  * pre-fix nested3 differs at `TEXT main,$32` vs `$16`, `SUBQ $32` vs
  * `$16`, and every `-24(BP)` vs `-16(BP)`; post-fix the two .s are
- * byte-for-byte equal. The sibling 989_nestfield_run is the RUNTIME
- * exit-code proof (deliberately NOT frame-gated — see its header); this
- * file is the .s/frame-absolute one #75 owes.
+ * byte-for-byte equal. The sibling RUNTIME exit-code proof migrated to
+ * test/lang/nestfield_test.ww (@test field-read rows, cs==ww via the T2
+ * byte-id gate); this file is the .s/frame-absolute one #75 owes.
  */
 #include <stdio.h>
 #include <stdlib.h>