dangernoodle-io / breadboard / 28499303081

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refactor(bb_event_routes): topic registry via bb_registry primitive (B1-442) (#629)

- extract attached-topics dedupe/lookup/index bookkeeping into
  bb_event_topic_registry, a private register-only API shared by
  bb_event_routes_common.c and the ESP-IDF/host and Arduino backends
- host/ESP-IDF backend wraps the generic bb_registry primitive under a
  wrapper mutex; Arduino backend is a plain pthread-free linear-array
  scan (loop() is single-threaded)
- common.c and the Arduino cpp stay free of bb_registry.h/pthread.h,
  preserving Arduino/AVR portability
- fix two LCOV_EXCL marker placements left on the interrupted edit so
  branch exclusion lands on the condition line, not the body — restores
  100% branch coverage on bb_event_routes_common.c
- add test_bb_event_topic_registry.c (11 cases, 100% branch coverage on
  the new host source)

1846 of 1846 branches covered (100.0%)

Branch coverage included in aggregate %.

27 of 27 new or added lines in 1 file covered. (100.0%)

3184 of 3184 relevant lines covered (100.0%)

1250.25 hits per line