Add per-session history, tab completion, interactive prompts, and
bounded input handling. Support deferred lifecycle and host-key actions
after output drains, and document the expanded administration workflow.
Update validation and duplicate checks to scope key uniqueness per
account, and clarify the console error message. Document cross-account
key assignment and authentication testing.
Add a short-lived, HMAC-keyed cache for validated principals and
invalidate entries when principals become stale. Improve duplicate SSH
key
errors and enable Ed25519 streaming verification.
Commander1024