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Introduces a FeatureEntryPoint for the recovery-key setup screen so enterprise builds can vend a richer setup node. The FOSS default builds the standard auto-generated-key node; SecureBackupFlowNode now resolves the Setup and Change targets through this seam instead of creating SecureBackupSetupNode directly. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>