dangernoodle-io / breadboard / 28637761154

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feat(bb_transport_health): per-transport connectivity-health SSOT (authoritative/inferred) (#682)

- new leaf component tracking per-transport up/down state in one place
- AUTHORITATIVE slots report explicit ok/fail via bb_transport_health_report()
- INFERRED slots derive health from bb_transport_health_mark_activity() recency,
  staleness computed at snapshot time via bb_transport_health_is_stale()
- bb_transport_health_authoritative_counts() only counts enabled AUTHORITATIVE
  slots — INFERRED transports structurally cannot influence this count
  (observe-only guarantee)
- single global lock (portMUX on espidf, no-op on host) guards all slot state
- lazy self-init idiom, fixed BB_TRANSPORT_HEALTH_MAX_SLOTS slot table,
  no bb_registry entry — zero init-ordering surface by design
- Kconfig-bridged BB_TRANSPORT_HEALTH_MAX_SLOTS (default 8) and
  BB_TRANSPORT_HEALTH_INFERRED_STALE_S (default 60)
- host tests cover registration/capacity, report/mark_activity class
  rejection, enabled exclusion, snapshot cap-truncation, and the
  observe-only invariant directly
- PR1 of 2: component only, zero consumers wired yet

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