A rename under a live multiplexer that could not reach the control verb warned and
stopped there, leaving the operator with no way to finish: the rename cannot be
repeated (profiles/<old> is gone) and the CLI deliberately never rewrites the
routing DB a live gateway holds in memory.
- `hermes profile migrate-identity <old> <new>`: retries the migration —
delegates to the gateway control verb while a multiplexer is live, performs the
durable rewrite of both state DBs when none is. Idempotent, and exits non-zero
naming the offending database on a collision, a lock, or a partial failure. Only
the name format and the existence of the new profile are checked; the old profile
directory is expected to be gone.
- An older gateway that does not implement the verb is reported as such (`identify`
answers while the migrate verb does not), not as "no gateway".
- `_migrate_profile_identity` returns an explicit success/failure result so the
command can set its exit code; the rename warning now names the exact invocation.
- A failed control answer keeps the raw payload when it carries no reason field.
- The offline failure branch called `click.echo` in a module that never imports
`click`: a failed second database raised NameError instead of printing its warning.
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