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Rewrite the SecurityGroup design doc for the targetRef projection: selector derivation from lineage labels, the structural (not selector-validated) RBAC boundary, and the additive-policy reality — a SecurityGroup can only widen a managed application's allowed traffic, never sever its platform-managed management plane, and equally cannot tighten below the platform baseline. Records the deliberate caveats: raw non-application pods are not targetable, and a targetRef to a non-existent application matches zero pods rather than erroring. Assisted-By: Claude <noreply@anthropic.com> Signed-off-by: Aleksei Sviridkin <f@lex.la>