Each entry in the vault now stores under key:mode instead of a bare
key, and get() resolves the active mode internally — falling back
from an empty test slot to live (never the reverse) so test operation
works before anyone has filled in test credentials, but live operation
never silently reaches for a test one.
get()'s signature is unchanged on purpose: its three callers
(HttpStripeClient, StripeCheck, SshTraefikWriter) have no business
knowing which mode is active. put()/forget()/source()/outline()/
updatedAt() take an optional trailing $mode for the console, which
will use it in a later task.
SecretVaultTest's raw app_secrets queries assumed the old bare key and
needed the :live suffix plus a pinned OperatingMode — otherwise they'd
depend on whatever mode an earlier test file left in the array cache.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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