dangernoodle-io / breadboard / 29626144605

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feat: add bb_data per-binding generation counter (touch/generation) (#917)

- adds _Atomic uint32_t generation to bb_data's binding slot struct
- bb_data_touch(key): producer calls after durably writing its value,
  bumps generation via atomic_fetch_add_explicit (memory_order_relaxed)
- bb_data_generation(key, *out_gen): reads current generation via
  atomic_load_explicit (memory_order_relaxed)
- coherence/invalidation signal only -- not a lock, no notify/callback
  surface; nothing consumes it yet (future SSE/WS drainer + cache-
  invalidation hook)


Claude-Session: https://claude.ai/code/session_01VA9XvWjJcbAUGCZpSFfp3H

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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