dangernoodle-io / breadboard / 28341360010

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feat: bb_ring single named constructor + reject-new policy (#589)

- collapse create/create_ex into one create(cap, max, policy, name, out); delete bb_ring_create_ex from header and implementation
- bounded internal name copy: BB_RING_NAME_MAX 24; strncpy + NUL-terminate; truncate on overflow; NULL name stores ""
- bb_ring_name(r) accessor for future telemetry registry (B1-414); returns "" for NULL handle
- reject-new full policy: BB_RING_REJECT_NEW; push returns BB_ERR_NO_SPACE without writing; oldest preserved
- clear preserves dropped/truncated counters across resets (cumulative diagnostics)
- add bb_event_topic_name(topic) public accessor to bb_event.h; implemented in bb_event_common.c; bb_event_ring uses it to name each ring after its topic string
- migrate bb_pub store-and-forward ring to new signature: BB_RING_EVICT_OLDEST + "pub"
- migrate bb_event_ring_attach_ex to new signature: BB_RING_EVICT_OLDEST + topic name
- migrate test_bb_ring.c: all call sites use new 5-arg create; add test_bb_ring_name_* tests (stored name, null ring, null name, truncation)
- test_main.c: declare + RUN_TEST 4 new bb_ring_name tests (file primarily serves commit 1; mdns RUN_TESTs are pre-existing from original 0e0c6d8 state)

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

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