dangernoodle-io / breadboard / 24963905075

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fix(bb_mdns): buffer set_txt items called before service start (#93)

bb_mdns_set_txt was a no-op when called before the service had actually
started. Apps typically configure TXT records right after bb_mdns_init()
but the service start is deferred until wifi gets an IP, so calls in
that window were silently dropped.

Buffer pending kv pairs (cap 8) and replay them via
mdns_service_txt_item_set immediately after the service is added.
Existing keys are updated in place to avoid stale duplicates.

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

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