dangernoodle-io / breadboard / 28608190195

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feat(bb_sub_mqtt): add MQTT ingress adapter with self-exclusion (#668)

- subscribes to configurable MQTT topic filters and routes messages into bb_sub_route()

- self-exclusion drops inbound messages published by this device's own hostname (metrics/<hostname>/* shape), default on

- adapted to the new bb_mqtt_on_message(h, cb, ctx) 3-arg API (PR2), passing the same bb_mqtt_default() handle used for subscribe

- documents the self-exclusion shape assumption (hostname at segment index 1) and fail-open-on-empty-hostname behavior in the header; add_topic emits a one-time warn when a non-default-shaped filter is added while ignore_self is on

- tightens the header contract: add_topic/set_ignore_self are boot-time-only, single-threaded config calls

- reworded the no-default-client log to state a reboot is required to apply config

- adds tests covering the subscribe-failure warn-and-continue branch (bb_mqtt_host_set_subscribe_fail) and multi-filter CONFIG_BB_SUB_MQTT_TOPICS comma/space parsing

- 100% branch coverage on bb_sub_mqtt.c; two genuinely-unreachable defensive NULL guards marked LCOV_EXCL_BR_LINE

1972 of 1972 branches covered (100.0%)

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68 of 68 new or added lines in 1 file covered. (100.0%)

3392 of 3392 relevant lines covered (100.0%)

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