HAIR 0.2.1 -- Sniffer dismiss fix

Fixes a bug where the Sniffer would silently drop signals from remotes after a specific dismiss + assign / delete sequence.

Affected users auto-recover on the next HA restart after upgrading thanks to a self-heal pass at load time -- no manual file editing required.

See the CHANGELOG for the full list of changes.

Reported by @KimmoJ (#9) and confirmed by @roblamoreaux.