test: port the xmod same-leaf collision carriers to corpus fixtures

752_modparam_callee.c -> r752_modparam_xmod_variadic_vs_scalar,
  r752_modparam_variadic_no_collision (run; alpha/beta module dirs)
784_xmod_alias_struct_collide_run.c -> r784_xmod_alias_struct_collide
  (run-exit 42), r784_xmod_alias_struct_symmetric (21),
  r784_xmod_alias_control (30) (sa/sb module dirs)
793_xmod_struct_argpush_collide_run.c -> r793_xmod_argpush_
  {recvpush_t16 107, fieldread_t16 107, combined_t16 114,
  recvpush_t12 6} (m1/m2 module dirs)
797_xmod_struct_field_layout_collide_run.c -> r797_xmod_layout_
  {ptrread_t16 107, letcopy_t16 107, addrptr_pq 10, addrval_pq 10,
  ptrwrite_t16 109, valwrite_t16 109} (m1/m2) + r797_nestfill_box (66)

r770-style sibling module dirs express the trees; the fixture corpus
runs both drivers natively (784's wwstage-build-only leg upgrades to
build+run) and test-data-byteid owns each carrier's aggregated per-
package .s compare (letcopy_t16's real discriminator). All 16 probed
green on both stages including per-package byte identity.

internal/wwfixture/types.ww

@@ -1,13 +1,13 @@
 package wwfixture;
 
 def protocolversion: i32 = 1;
-def corpuscount: i32 = 1643;
+def corpuscount: i32 = 1659;
 def errorcount: i32 = 338;
 def compilecount: i32 = 18;
-def runcount: i32 = 198;
-def runexitcount: i32 = 1089;
-def nativecount: i32 = 3286;
-def corpushash: str = "c2bfc683a76c7bffa727612f102893c7dbfdb9e73e56212eed8687b8087d7870";
+def runcount: i32 = 200;
+def runexitcount: i32 = 1103;
+def nativecount: i32 = 3318;
+def corpushash: str = "c9c9361b3f799c1439fb9009f8c6edfc7dbf36a263b789e65f239b3984661ffd";
 
 type directive = enum i32 {
 	ERROR = 0,