dangernoodle-io / breadboard / 28492056568

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feat(bb_pub): per-source MQTT retain + publish cadence (EVERY_TICK/ON_CHANGE/ONCE) (#624)

- add bb_pub_cadence_t enum (EVERY_TICK/ON_CHANGE/ONCE) to bb_pub.h
- add retain + cadence fields to bb_pub_telemetry_cfg_t
- add bool retain to bb_pub_publish_fn typedef (in-place, all callers updated)
- add cadence state (last_pub_hash, published_once) to bb_pub_telem_entry_t
- implement fnv1a64 hash for ON_CHANGE detection in phase 2b of bb_pub_tick_once
- gate sink delivery in phase 2b by cadence; pass per-source retain to sinks
- remove CONFIG_BB_SINK_MQTT_RETAIN kconfig; retain now per-source in cfg
- update bb_sink_mqtt, bb_sink_http, bb_sink_ws, bb_sink_event to accept retain
- update platform/espidf/bb_sink_ws to accept retain
- set meta source to cadence=ON_CHANGE, retain=true in bb_pub_telemetry_host
- update all test stub publish fns and direct sink.publish() call sites
- add 9 cadence/retain tests in test_bb_pub.c + 1 meta integration test

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