wcc_ww/cgen: #77 alias-NAMED global ARRAY emit — tichase at the dispatch entry (g-fold G2)

ww half of the #77+#78 fused g-fold train; completes the family. cs
half landed as the previous commit (G1) — the two ship together, one
gated train, per the fuse ruling on both tasks.

Root: the global DATA emit walk dispatched on the UNCHASED decl tnode —
a NO-PEEL consumer (zero `.under` tokens on the path; it never learned
aliases exist). An alias-typed global array's N_TNAME matched no arm
and the documented skip-policy ate the decl: w6c_ww referenced
main.g(SB) but emitted zero DATAW → loud `w6l: undefined reference to
main.g` on every direct alias-global array row (ken NEW-1, all k_gidx*
shapes). Every other kind was already chased (letvarisstr/isslice/
isfloat/isstruct walk aliaslookup chains; the tuple gate walks tnodes;
emitarraydata/emitslicedata chase tinfo internally; letemitsize walks —
registration was never the gap), probe-confirmed: only array rows
failed ww-side.

Fix: ONE tichase at the dispatch entry, per the spec's entry-point rule
— not per-arm. Dispatch arms touched (enumerated):
  emitletdataw (cgen.ww): hoisted `dti = tichase(d.lhs.type_)` at the
    per-decl entry; the isarr8 scalar-shortcut gate and the array arm
    now key on dti.kind == TY_ARRAY (were d.lhs.kind == N_TARRAY) and
    emitarraydata receives dti; the struct zero-fill arm's inline
    TY_NAMED loop collapses into the same dti (ef93b16 precedent,
    byte-neutral). str/float/struct/slice/tuple gates unchanged.
  letpreintern (cgen.ww): the #18 [N]str array-leg gate keyed on the
    N_TARRAY tnode while its body already chased the tinfo — gate now
    keys on the chased kind, so alias-typed [N]str globals pre-intern
    their _S_ labels in decl order (label-order parity with cstage;
    the inner elem chase collapses into tichase).
For non-alias decls tichase is identity (same tinfo pointer) — the
emitted bytes are unchanged by construction; full byte-id invariant
holds (test-unit 288/288 incl. the new table).

main.combined.ww (w6c + wwdump) regenerated by `make` — diff verified
content-identical to the cgen.ww hunks, nothing else.

Graduation table committed as test/wcc/944_alias_global_decl_run.c —
23 rows x {cs run, ww run, byte-id} = 69 checks green. This table IS
the permanent guard: the path is lint-invisible (NO-PEEL — nothing for
the future peellint to see), so only a runtime+byte-id row pins it.
Rows: plain control; alias array 1-lvl read/write/decl-order; 2-lvl
read + order-permuted write (the #78 silent saved-BP rows); [4]u32
narrow-esz; scalar/str/f64/f32 2-lvl; alias-of-named-struct field w/r
(the cs SEGV-at-one-user-level row) + 3-layer + STRUCTLIT init; slice
2-lvl literal; [2]str 1-lvl/2-lvl (letpreintern label leg); def-side
2-lvl array/struct/float; no-regression holds (alias global SLICE,
alias ELEMENT [2]row). Values >255, LAST element asserted.

Probe-OUT rows documented in the test header, filed not pinned: #86
(named-tuple global init: cs checker loud-reject vs ww accept), #87
(plain tagged global: cs silent-wrong vs ww loud-reject, non-alias).

Makefile

@@ -305,6 +305,7 @@ TESTS	= $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
 	  $(BIN)/test_alias_decl_order_size_run \
 	  $(BIN)/test_alias_accept_run \
 	  $(BIN)/test_alias_idx_family_run \
+	  $(BIN)/test_alias_global_decl_run \
 	  $(BIN)/test_tuple_nary_destructure_run \
 	  $(BIN)/test_rvalue_tuple_destructure_run \
 	  $(BIN)/test_overcap_tuple_field_store_run \
@@ -1467,6 +1468,12 @@ $(BIN)/test_alias_idx_family_run: test/wcc/944_alias_idx_family_run.c \
 		$(LIB)/libwwrt.a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
+$(BIN)/test_alias_global_decl_run: test/wcc/944_alias_global_decl_run.c \
+		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
+		$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
+		$(LIB)/libwwrt.a | $(BIN)
+	$(CC) $(CFLAGS) -o $@ $<
+
 $(BIN)/test_tuple_nary_destructure_run: test/wcc/945_tuple_nary_destructure_run.c \
 		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \