dangernoodle-io / breadboard / 26000040336

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feat(bb_event_routes): GET /api/diag/events — topic discovery + ring diagnostics (#251)

* feat(bb_event_routes): GET /api/diag/events — topic discovery + ring diagnostics

- add bb_event_ring_count and bb_event_ring_last_entry_info accessors (ring.h/ring.c)
- add bb_event_routes_topic_count, bb_event_routes_topic_info, bb_event_routes_active_client_count accessors (routes.h/common.c)
- register GET /api/diag/events on esp-idf path with full openapi response schema
- add test_bb_event_ring_introspection.c: 13 tests for count/last_entry_info on empty + populated ring
- add test_bb_event_routes_diag.c: 13 tests for topic_count/topic_info/active_client_count including round-trip
- register all new tests in test_main.c (828 tests pass, 100% branch/line/function coverage)
- update CLAUDE.md event bus section with /api/diag/events debug tip

* fix(bb_event_ring): define _POSIX_C_SOURCE for clock_gettime on Arduino targets

* fix(bb_event_ring): use Arduino micros() on bare-metal Arduino targets

Renesas arm-none-eabi newlib lacks CLOCK_MONOTONIC regardless of
_POSIX_C_SOURCE. Mirror the bb_button_events pattern: ESP/Arduino/POSIX
three-way branch.

* fix(bb_event_ring,bb_event_routes): add missing IDF PRIV_REQUIRES

- bb_event_ring needs esp_timer for esp_timer_get_time()
- bb_event_routes_espidf.c needs bb_json

Surfaced by ESP-IDF smoke build (esp_timer.h not found).
Component CMake leak filed as B1-202.

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41 of 41 new or added lines in 2 files covered. (100.0%)

1702 of 1702 relevant lines covered (100.0%)

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