dangernoodle-io / TaipanMiner / 28697022486

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feat(main): wire bb_sink_ws WebSocket telemetry egress onto /ws (#618)

WS egress was never wired on TM: CONFIG_HTTPD_WS_SUPPORT was unset fleet-wide
and main.c never called bb_sink_ws_init, so httpd 400s the /ws handshake.
Ports the validated wiring from jae/ws-egress-v1: register bb_sink_ws as a
second bb_pub fan-out sink (alongside SSE/MQTT) so /ws streams the same
typed {"type":"push","topic":..,"data":..} envelope. Non-fatal: SSE/MQTT
still work if WS registration fails.

CONFIG_HTTPD_WS_SUPPORT=y moves to sdkconfig.defaults so bb_websocket/
bb_sink_ws compile their real implementation fleet-wide instead of the
BB_ERR_UNSUPPORTED stub. esp32-c3-supermini already caps SSE to 1 connection
(B1-561); WS is now available alongside it.

HW-validated on esp32-c3-supermini (.10): WS handshake 101, sub/push frame
delivery confirmed, /api/diag/websocket open_connections tracks live
connections, SSE unaffected, mining continuous, heap stable (~17KB internal
free, no continued decay), wdt_resets 0.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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