test: port 696/697/699 resolver carriers to corpus fixtures

696_modtype_leaf_collision.c -> r696_modtype_leaf_pos (run-exit 26),
  r696_modtype_leaf_neg (staged error; w6c 'no field', w6c_ww
  asserttyped: dot — the old no-wwstage-checkfile comment is stale)
697_samemod_prefer.c -> r697_samemod_prefer (compile)
699_use_promote_alias.c -> r699_usepromote_{type,fn,def,var}
  (run-exit 42 each)

Single-file multi-package form folds the modcollision/samemodprefer/
usepromote data trees into the fixtures; the trees retire with their
carriers. The dir-tree .wwi transport of colliding type decls is owned
by test/byteid/wwi_test.ww. Coverage upgrades: 697 and the 699 rows
gain the wwstage leg the carriers gated or skipped, and all positive
rows enter the blanket test-data-byteid net.

internal/wwfixture/types.ww

@@ -1,13 +1,13 @@
 package wwfixture;
 
 def protocolversion: i32 = 1;
-def corpuscount: i32 = 1634;
-def errorcount: i32 = 336;
-def compilecount: i32 = 17;
+def corpuscount: i32 = 1641;
+def errorcount: i32 = 337;
+def compilecount: i32 = 18;
 def runcount: i32 = 198;
-def runexitcount: i32 = 1083;
-def nativecount: i32 = 3268;
-def corpushash: str = "cb7cf09decc2f64b40c1f06b836c5b2aec0a4f1b9b2a78665f228606a0245a1f";
+def runexitcount: i32 = 1088;
+def nativecount: i32 = 3282;
+def corpushash: str = "d518a094a11081af773549c53a6830c510685ef44548c8ea01400e0661c37e65";
 
 type directive = enum i32 {
 	ERROR = 0,