0.16.0

Added

• Load view: UniFi switch ports carry throughput (#53, from Sam /
  @slmingol). The controller reports a rolling byte rate per switch port,
  the same figure its own UI shows, and the collector now stores it as the
  port's in/out rate and as a rate_history sample. Switch-to-switch and
  switch-to-AP legs on UniFi-managed switches color in the load view and
  get a 24-hour peak, where before only SNMP-polled ports did. An AP's
  uplink carries the same figures and is stored too. A down device keeps
  its last good reading, as it does for port status and speed.

• Load view: the busier end of a cable wins. Where both ends of a
  link report a rate, the edge used to show whichever end sorted first by
  name. The two ends read the same wire through different windows, a
  UniFi rolling rate against a five-minute SNMP average, so the edge now
  shows the higher reading, for the current figure and the 24-hour peak
  separately. A burst one poller caught no longer hides behind the
  other's average.

Changed

• Deployment guide: verify snapshot delivery before you need it (#25).
  A new step walks through mounting the off-host share into both patchbay
  services, triggering one snapshot, checking the share from another
  machine for the renamed copy and no leftover .part file, waiting for
  the sync, and opening the off-host copy with the stack down.

Fixed

• Rate samples age out whatever the source. The seven-day
  rate_history prune lived in the LibreNMS collector, so a site whose
  rates came from another source would have kept every sample forever.
  The normalizer's housekeeping pass prunes now, every cycle, beside the
  raw-payload expiry.

• The test suite passes under bare pytest (#54, from Sam / @slmingol).
  Two test modules import helpers from a sibling through the tests
  package, which resolves only with the repository root on the path.
  python -m pytest puts the working directory there and plain pytest
  does not, so the same tree passed on one machine and failed eight tests
  on another. The pytest config adds the root now.