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fix(bb_update_check): publish initial snapshot after ring is attached (#257)

Fixes cold-boot SSE client issue where ring_count=0 until first scheduled check
(B1-209). bb_update_check_init() no longer posts the initial snapshot; instead,
callers must explicitly call bb_update_check_publish_initial() after attaching
a ring/routes to the topic. This ensures the snapshot is posted only after the
consumer is subscribed, closing the race window.

The ESP-IDF platform implementation (bb_update_check_register_init) calls
publish_initial() automatically after bb_event_routes_attach_ex() completes,
gated on CONFIG_BB_UPDATE_CHECK_AUTO_ATTACH.

Verified on host: bb_update_check_init alone leaves ring_count=0; explicit
publish_initial call populates it to count=1. Bench tests confirm SSE clients
now see ring_count>0 from cold boot.

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

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