Review fixes for the once-per-episode connect_failed dedupe:
- The episode was latched before the collection-consent gate, so a failure
seen while shared metrics were off suppressed the first consented day's
connect_failed. _record_connect now returns without latching when
collection is off: only a recorded failure opens an episode.
- Local episode state was keyed by the privacy-projected platform name, so
two custom adapters (both emitted as "plugin") shared one episode and one
adapter's recovery closed the other's outage. The key is now the adapter's
real platform value; projection happens only at emission.
- Docs: the hermes.platform.health row describes the episode semantics.
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