dangernoodle-io / TaipanMiner / 24970767618

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feat(knot): periodic mdns re-query to self-heal stale txt (#216)

Add observer-side periodic re-query timer (45s interval) to snapshot peer
table and query fresh TXT records via mdns_query_txt(). Results flow
through existing on_peer_discovered upsert path with knot_table_apply_txt
to refresh worker/board/version/state fields. Complements bb_mdns_announce
publisher-side fix (breadboard v0.15.0); together they address cases where
IDF's mdns_browse misses TXT-only updates on already-known peers.

Timer: esp_timer periodic, file-scope static. On success queries fire
on_peer_discovered; on failure logs at debug level only (expect eventual
removal callback when TTL expires).

Closes TA-251.

Hardware verification deferred (manual: flash two miners, OTA one, watch
the other's /api/knot reflect the new version within ~45s).

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

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