`KnownHosts::load()` mints a stable id for any record that lacks one and SAVES it — which makes
it a write, and `discover` was calling it purely to annotate what the browse found with
saved/paired. It never hands those ids back to anyone.
That matters because the Decky panel issues `discover` and `hosts list` together, in parallel.
Against a store written before ids existed, both processes read it, both mint DIFFERENT ids for
the same record, and both save. Whichever loses the race has already handed its ids to its
caller — so the panel could draw a row whose host reference no longer resolves, and pressing it
would exit 5 ("no saved host matches") until the next refresh settled things.
`KnownHosts::read()` is `load` without the mint: the store exactly as it is on disk. `discover`
uses it; every caller that dials a host by id still uses `load`, so ids are still minted the
first time anything needs one.
Verified on a fixture store with no ids: `punktfunk discover` leaves it byte-identical, and a
following `punktfunk hosts list` mints as before.
enricobuehler
414380fc9e