Cross-module recursive_type_set import-merge fix (04_infer.dag:5422/5551): imported alias names mis-enter the consumer recursive_type_set -> spurious Box on concrete imported-alias fields (BROAD §3 emit/inference correctness, measure the most-visible instance). GATES: design-checkpoint to parent bef

[briansrls]

Auto-opened by session-dashboard for session smart-cat-841.
Pushing to session/smart-cat-841 advances this PR.

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Summary

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[gunbai-bot]

Superseded by #5624 (canonical cross-module recursive_type_set import-merge lever). This branch (session/smart-cat-841) is the stray duplicate worker's PR — parent already ruled #5624 canonical and this duplicate to be archived (no competing 04_infer change). Closing rather than fixing CI: advancing this PR would create exactly the competing 04_infer change that was forbidden. The real lever work continues on #5624.