dangernoodle-io / breadboard / 28503889413

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feat(bb_websocket): expose open-connection + SSE-stream diag telemetry (B1-443) (#634)

- SSE stream count already fully exposed at GET /api/diag/events
  (top-level active_clients/max_clients from bb_event_routes) — left
  unchanged, no duplication
- add bb_websocket_open_count(): espidf impl increments on WS handshake
  completion and decrements via httpd's req->sess_ctx/free_ctx hook
  (atomic_size_t, no lock needed — connect/disconnect are the only
  writers and each fires once per session)
- new bb_websocket-owned GET /api/diag/websocket route
  (platform/espidf/bb_websocket/bb_websocket_diag.c), mirrors
  bb_event_routes_espidf owning /api/diag/events; self-registers via
  BB_INIT_REGISTER, gated by CONFIG_BB_WEBSOCKET_DIAG_AUTOREGISTER
  (default y, infrastructure route)
- host stub: bb_websocket_host_simulate_open/close test hooks drive a
  plain counter (the espidf connect/disconnect hooks have no
  host-testable seam — depend on httpd_req_t internals; smoke build
  covers compile)
- 5 new host tests: zero-by-default, increments, decrements, clamp at
  zero, reset by reset_captures

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