wcc/cgen: #117 pin scalar-tuple-slice row (broad-arm in-suite net)

rob A-corrected: the broad TY_TUPLE arm stays; pin an accepted non-(str,*fn)
scalar-tuple slice in-suite. const [](i64,str) with TYPED 1i64 (untyped int
is ww-checker-rejected, #120); scalar-first so the i64 reads back via the
word0-correct whole-element cursor (#121: .1/word3 truncated). Distinct
values + len(t) + cs==ww byte-id lock the scalar-in-slice-backing path.
Base f8be2ae has no TY_TUPLE arm -> louds. Test-only; 17/17 ok.

test/wcc/946_const_slice_aggregate_run.c

@@ -129,6 +129,27 @@ static const struct row rows[] = {
 	  "	if (len(tbl) != 3) { return 1; };\n"
 	  "	return 0;\n"
 	  "};\n", 0, K_RUN, NULL },
+	/* #117 broad-arm pin (rob): the TY_TUPLE arm also backs an ACCEPTED
+	 * non-(str,*fn) scalar-tuple slice — (i64,str) with a TYPED i64 (a bare
+	 * untyped int is ww-checker-rejected, #120). Scalar FIRST so the i64
+	 * reads back via the word0-correct whole-element cursor (#121 read-path:
+	 * .1/word3 is truncated, same constraint as the fn-first row). DISTINCT
+	 * values catch a wrong per-row stride/offset; len(t) pins the header; the
+	 * str element rides the 32B backing (its DATAR + len pinned by cs==ww
+	 * byte-id). Base f8be2ae has no TY_TUPLE arm → louds (broad arm is new). */
+	{ "scalar_tuple_slice",
+	  "package main;\n"
+	  "const t: [](i64, str) = [(10i64, \"a\"), (20i64, \"bb\")];\n"
+	  "export fn main() i32 = {\n"
+	  "	let e0 = t[0];\n"
+	  "	let e1 = t[1];\n"
+	  "	let v0 = e0.0;\n"
+	  "	let v1 = e1.0;\n"
+	  "	if (v0 != 10) { return 1; };\n"
+	  "	if (v1 != 20) { return 2; };\n"
+	  "	if (len(t) != 2) { return 3; };\n"
+	  "	return 0;\n"
+	  "};\n", 0, K_RUN, NULL },
 	/* #119: scalar &fn module-globals — DISTINCT fns, each called back
 	 * through the reloc (pre-#119: no DATA → undefined ref / garbage). */
 	{ "scalar_fnptr",