dangernoodle-io / breadboard / 27473833579

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feat(bb_pub,bb_mqtt_telemetry): free the inactive transport on exclusive-slot loss + deterministic documented precedence (B1-275) (#421)

- when bb_mqtt_telemetry_init finds the exclusive slot already taken (mqtt
  lost the boot race), write enabled=0 to nvs then call bb_mqtt_reconfigure()
  so the early-connected auto-client is stopped and its heap freed immediately
  — no reboot required; previously only nvs was updated and the esp-mqtt task
  remained alive, keeping heap fragmented
- document that boot precedence is first-PRE_HTTP-registrant-wins (not
  hardwired "mqtt wins"); breadboard default order still gives mqtt the slot,
  but consumer apps that register http telemetry first get http as winner
- CLAUDE.md updated to match actual behavior (removes incorrect "mqtt wins"
  universal claim; replaces with registration-order rule + loser-teardown note)
- http transport is lazy (no session at boot) so http loser needs no teardown
- three new host tests: mqtt-loser triggers reconfigure, mqtt-winner emits no
  spurious reconfigure, runtime disable triggers reconfigure (2050 → 2053)

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