dangernoodle-io / breadboard / 25874452879

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feat(bb_event_routes): GET /api/events SSE handler (B1-194) (#228)

New component layered on bb_event + bb_event_ring + bb_http:
- bb_event_routes_attach(name) surfaces a topic on /api/events
- Multi-client SSE (Kconfig-capped) with per-client queue
- Drop-oldest on slow-client overflow; SSE `id:` jumps reflect gaps
- Replay-on-connect via bb_event_ring_subscribe_with_replay
- 15s heartbeat (`: ping`) for dead-peer detection
- Payload contract: caller posts valid UTF-8 JSON, route emits raw

Platforms:
- ESP-IDF: per-client FreeRTOS task, FreeRTOS recursive mutex
- Host: pthread mutex; tests drive drain explicitly
- Arduino: 503 stub (RAM-constrained CC3000 boards don't need SSE)

Smoke example attaches `smoke.heartbeat` so /api/events is exercised
end-to-end on the esp32 / esp32c3 / r4_wifis3 / tdongle / elecrow envs.

100% line + branch coverage on host (28 new tests, 669 total).

Resolves B1-194.

682 of 682 branches covered (100.0%)

Branch coverage included in aggregate %.

164 of 164 new or added lines in 1 file covered. (100.0%)

1111 of 1111 relevant lines covered (100.0%)

1286.24 hits per line