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/data/arr_nested_ellipsis_reject/case.ww

@@ -0,0 +1,7 @@
+//ww:error "repeat with nested-array elements"
+// #156/rule-7 carrier: a `...` repeat marker with a nested-array element must
+// REJECT on both stages (no consumer needs it; powers_of_ten is fully
+// enumerated). From test/wcc/919_array_static_init_run.c nested_ellipsis_reject.
+package main;
+let A: [4][2]u64 = [[1u64, 2u64]...];
+export fn main() i32 = { return 0; };

test/wcc/data/const_divzero_reject/case.ww

@@ -0,0 +1,8 @@
+//ww:error "division by zero"
+// #133/rule-7 carrier: a div-by-zero const-expr module-global init stays a
+// COMPILE error in BOTH stages, NOT silently zeroed (the eval_def_const error
+// path survives the let-hook). From test/wcc/947_inferred_scalar_global_run.c
+// const_divzero.
+package main;
+let s = 7 / 0;
+export fn main() i32 = { return s: i32; };

test/wcc/data/slice_of_str_reject/case.ww

@@ -0,0 +1,8 @@
+//ww:error "slice-of-{str,slice,tagged}"
+// #117/rule-7 carrier: a non-tuple aggregate element (a bare []str) in a
+// const-slice static-init stays a LOUD reject in BOTH stages — #117 is narrow
+// to the (str,*fn) tuple form. From test/wcc/946_const_slice_aggregate_run.c
+// loud_slice_of_str.
+package main;
+const xs: []str = ["a", "b"];
+export fn main() i32 = { return len(xs): i32; };