dangernoodle-io / breadboard / 25827294893

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feat(bb_event): generic app-level event bus with replay ring (B1-103) (#222)

Two new components:

- bb_event: portable callback-list publish/subscribe event bus. Opaque
  topic handles, queued dispatch with payload copy. ESP-IDF backend uses
  a FreeRTOS dispatcher task; Arduino backend uses cooperative
  bb_event_pump() from loop(); host backend uses a pthread dispatcher
  (sync mode via BB_EVENT_HOST_SYNC env var for tests). Auto-registered
  via bb_registry early tier (CONFIG_BB_EVENT_AUTOREGISTER).

- bb_event_ring: sibling component layering a replay-on-subscribe
  circular buffer on top of bb_event for SSE/WebSocket fan-out and event
  history scenarios.

Public headers contain no esp_* types per breadboard portability rules.

Includes:
- Unity host tests covering core API, error paths, payload integrity,
  and ring replay semantics. Topic limit raised to 64 for native test
  env to exercise pool-exhaustion paths.
- Smoke example heartbeat demo across ESP-IDF and Arduino targets;
  disabled on uno_cc3000 (AVR/CC3000) due to SRAM/flash budget.
- CLAUDE.md and README component-map entries.

Follow-up B1-178 tracks moving bb_event_port.h back to a private
location once a sanctioned ring-locking API is exposed.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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