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feat(bb_pub,bb_telemetry): mutually exclusive telemetry sinks (enabling one while another is active → 409) (#418)

- add bb_err_t BB_ERR_CONFLICT to bb_core.h (host=9, espidf=ESP_ERR_INVALID_ARG+0x1001)
- add exclusive-sink arbiter to bb_pub: bb_pub_exclusive_acquire/release; BB_PUB_TESTING exposes bb_pub_exclusive_reset()
- mqtt_section_patch and httppub_section_patch call acquire on enabled=true, release on enabled=false; conflict returns BB_ERR_CONFLICT without persisting
- bb_telemetry_routes maps BB_ERR_CONFLICT → HTTP 409 with json error body
- boot precedence: both _init fns check NVS enabled at startup; mqtt wins (registered first in PRE_HTTP walk); http _init finds slot taken, logs warning, writes enabled=0 to NVS
- add bb_pub to PRIV_REQUIRES for bb_mqtt_telemetry and bb_sink_http_telemetry CMakeLists
- 15 new host tests: arbiter unit (acquire/release/idempotent/reset), section mutex (mqtt↔http conflict, disable-then-enable), boot precedence (both/mqtt-only/http-only/neither)

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