Fix "e_tag: unexpected layout type" crash when using direct recursive references in tag union variants #8756
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Fixes #8754
src/layout/store.zig- Core fix: When processing a nominal type whose backing type is already cached (due to processing the same nominal with a different type variable), immediately update the placeholder layout instead of leaving it asBox(opaque_ptr).src/repl/eval.zig- REPL improvement: Added storage for type declarations so multi-line REPL sessions with type definitions work correctly.test/snapshots/repl/recursive_direct_variant.md- Added REPL snapshot test for the bug case.