Sketches the options for issue 010: the mesh's identityLimit (63, postgres's) is not
the shortest among the backends the derived name reaches — S3's is 20 — so CheckIdentity
lets an over-long access key through and minio fails at provision time. Options: bound
by the true minimum and refuse at assignment (recommended, with a compact fallback held
in reserve), per-interface bounds, or a provider-generated identity (rejected — breaks
"the mesh says the identity once"). Links issue 010 to it.
Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF
