docs(metatype): issue 0139 resolved; by-value self-ref rejection done

current/PLAN-METATYPE.md

@@ -113,10 +113,11 @@ while red. Examples: `06xx` (comptime), `11xx` (diagnostics).
       `define`'s decode): widen `TypeInfo` past `` `enum `` (struct/tuple) AND
       construct a `[]EnumVariant`-style value in the interpreter. Bails loudly today
       in `call.zig:tryLowerReflectionCall`. Round-trips through `define` once it lands.
-- [ ] **Validation + loud diagnostics** — duplicate variant names, by-VALUE
-      self-reference (`payload = List` not `*List` → infinite size), a `declare()`
-      never `define()`d (hard error), use-before-define. Emit at the
-      `intern`/`internNominal` choke point; never a broken type.
+- [~] **Validation + loud diagnostics** — by-VALUE self-reference DONE
+      (`checkInfiniteSize` Pass 1g: loud "infinitely sized" diagnostic + cycle
+      break, covers source + comptime types; `examples/1178`, issue 0139 resolved).
+      Still pending: duplicate variant names, a `declare()` never `define()`d
+      (hard error), use-before-define.
 
 ## Risks / watch