dangernoodle-io / breadboard / 28493726024

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feat(bb_registry): generic name->handle object registry primitive (#626)

- add components/bb_registry/ with portable header (bb_registry_entry_t,
  bb_registry_t, BB_REGISTRY_DEFINE/TAGGED macros) and CMakeLists
- add BB_REGISTRY_SNAPSHOT_MAX 64 constant; _Static_assert in both declare
  macros enforces capacity <= SNAPSHOT_MAX at compile time
- add platform/host/bb_registry/bb_registry.c — shared impl compiled on
  host and esp-idf; all ops lock-guarded (pthread_mutex_t)
- foreach uses fixed-size stack copy-out (BB_REGISTRY_SNAPSHOT_MAX entries,
  no VLA); callbacks run without the lock held; doc clarifies stale-snapshot
  semantics instead of the incorrect 'deadlock' claim
- HWM warn fires after count increments to capacity-1 (one slot still free),
  giving callers advance notice before the registry fills
- deregister compacts left (no tombstones); bb_registry_reset gated by
  BB_REGISTRY_TESTING for test teardown
- wire into platformio.ini custom_bb_components + BB_REGISTRY_TESTING flag,
  native_scaffold.py COMPONENT_MAP, and examples/smoke SMOKE_REQUIRES
- 25 unity host tests in test_bb_registry.c; 100% line coverage on
  bb_registry.c; all 2985 tests pass


Claude-Session: https://claude.ai/code/session_01K92HwuHoUDp2ccrQYojH23

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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