dangernoodle-io / breadboard / 28183778496

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feat: bb_sink_ws bb_pub WebSocket sink + multiplexed /ws (events/telemetry/logs) (#556)

- components/bb_sink_ws/: new component (CMakeLists.txt, Kconfig, include/bb_sink_ws.h)
- platform/host/bb_sink_ws/bb_sink_ws.c: shared implementation (host + ESP-IDF)
  - publish callback wraps each payload as {"ch":"<subtopic>","data":<json>}
  - broadcasts TEXT frame to all active WS clients via bb_websocket_broadcast_all
  - transport="websocket", tls=false in sink descriptor
  - BB_SINK_WS_TESTING gate exposes bb_sink_ws_reset_for_test()
- test/test_host/test_bb_sink_ws.c: 11 tests, 100% line/function/branch coverage
- scripts/native_scaffold.py: add bb_sink_ws entry
- platformio.ini: add bb_sink_ws to custom_bb_components + BB_SINK_WS_TESTING flag
- examples/smoke/main/CMakeLists.txt: add bb_sink_ws to SMOKE_REQUIRES

openapi: /ws descriptor registered via bb_websocket_register_described_endpoint
(caller supplies static bb_route_t; bb_sink_ws_init wires the publish side only)

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

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