`natsOldPath` exists to prove every old `swarm.nats.*` path still
resolves through its rename shim, and it defined six of the seven —
`enable` was spelled the NEW way (`deploy.nats.enable`), so nothing in
the suite ever exercised that shim. Deleting it would have gone
unnoticed.
The comment above the fixture claimed more than the fixture delivered:
"dropping any single shim entry fails the eval" reads as a guarantee
over all seven. Closing the gap rather than narrowing the sentence, so
the claim becomes true instead of merely careful.
`autheliaOldPath` keeps `deploy.nats.enable` deliberately — it needs the
queue on, it is not an old-path test for nats — and the gate controls
both spellings so a future edit cannot silently swap them.
Found by asking the fixture whether a planned mutation could fail before
spending an eval on it: no fixture defined the old path, so the arm was
guaranteed to survive. A grep answered in a second what a mutation would
have taken ~6 minutes to report.
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