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18f0f40e74
* Add seahaven-security member baseline (Phase 3) Account 001520130573 is the org's delegated security administrator. Same member-baseline construct set as external-dev; own CD job under its own OIDC role. Created at org root pending manual root hardening before the OU move (deny-root-user invariant). * Document delegated security administration runbook Delegation to seahaven-security has no CloudFormation types; the CLI sequence is the record, same pattern as the other account toggles. * Apply Phase-3 security-review findings Delegation runbook marked PENDING with hard preconditions (baseline deployed, root MFA verified, account inside the security OU) — it had read as applied before execution, the org's known claimed-done-but-NOT failure mode (SEC-BASE-A/B). New security-guardrails SCP on the security OU: region lock, IAM user/key lockout, privileged-role protection, delegated-admin membership protection (SEC-BASE-C, cross-reviewed APPROVE). deploy-security gains stack-name pre-flight (SEC-BASE-D). Default VPC in 001520130573 deleted; empty flow-log list and aws@ alert routing documented as deliberate (SEC-BASE-F/H). |
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