Intel N355 mini PC, 2x I226-V, UEFI/NVMe disko, systemd-boot. Only
2configs + retiolum + gg23 for now; NIC naming matches styx (et0 uplink,
int0 LAN). Retiolum card in retiolum/ (10.243.11.2), server tag.

update.sh: the hash probes ran under pipefail/errexit, so an expected hash-mismatch build produced an empty result and the script exited without touching the hashes.

Picks up the darwin tinc-up fix on lassulus/fixes: route the IPv4 prefix into
the utun. Without it macOS only installed a host route for the tunnel address
and every IPv4 packet for the mesh left through the default gateway. Same bug
kartei carried in its copy of the module (krebs/kartei#65); 28a957a6 switched
barnacle to tincr own module, which never had that fix.

Integration branch = Mic92/main + #101 (NAT-leaf dial, loop clock, tunnel-address gate) + #109 (EMSGSIZE clamps minmtu, counts as probe miss, TCP fallback, MTU_INFO clamp mid-rediscovery). Fixes the retiolum blackhole seen as 'pmtu 1293 (min 1319 max 1488)'.

update.sh now blanks both hashes before the probe builds: with the old ones in place nix reused the cached FODs and the bump built stale code.