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Both network_security and code_security are now atom-grain. Per-sub_topic use_case routing: secure_development -> code_security (best for secure-dev findings), everything else -> network_security. Findings carry breadth_use_case so the source context (which atom corpus) is visible under the best-practice depth. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>