Vault's ssh-client-signer mount was undocumented here entirely. Adds it as flow 2/5 rather than merging into Certificate Flow, since the actual mechanism differs (own systemd timer, bypasses Vault Agent's render cycle, only reuses its cached token) - and explains why that distinction matters for debugging. Diagram updated to match: a third data-plane box feeding fleet-wide sshd trust instead of a container.
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