The SSH CA mount (ssh-client-signer/) existed live in Vault but was
missing from this doc's capability list entirely. Adds it as a fourth
"What It Does" bullet with real role config and a live screenshot of
the secrets engines list, and refreshes the stale ACL policies
screenshot (was showing 15 policies, live is 18).
Access model now covers the narrowly-scoped read-only utility policies
(ansible sync roles, metrics-reader, pki-reader) alongside the
host-scoped svc-* pattern - the fuller picture confirmed live against
Vault's actual ACL policy list, not just the original narrower claim.
Added two real screenshots: the live policy list, and an actual audit
log entry showing a KV read with every secret value as hmac-sha256:...
instead of plaintext - proof for the audit-trail claim instead of just
an assertion of it.