dangernoodle-io / breadboard / 27455515392

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feat(bb_mqtt): hot-reconnect on config change (apply broker/cred PATCH without reboot) (#410)

- add bb_mqtt_reconfigure() to public api: re-reads nvs "bb_mqtt" and applies
  it to the live esp-mqtt client (stop→destroy old, re-init with new config)
- esp-idf impl: safe teardown order (client_stop → client_destroy → tls_creds_free),
  reuses deferred-start path when no ip yet, reentrancy guard via semaphore,
  disabled-path stops client and stays down
- host stub: increments s_reconfigure_count; accessible via
  bb_mqtt_test_reconfigure_count() (bb_mqtt_testing); bb_mqtt_host_reset clears counter
- wire mqtt_section_patch in bb_mqtt_telemetry_host.c to call bb_mqtt_reconfigure()
  after nvs persist — patch /api/telemetry {"mqtt":{...}} applies live
- 6 new tests: reconfigure count, idempotency, reset, patch→reconfigure wiring,
  disabled-path, new uri observable by get
- update claude.md bb_mqtt section: patch applies live via bb_mqtt_reconfigure

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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