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DM auto-resend (delivery status follow-up): - New pref dm_resend_count (0-5, default 2), Settings › Messages › Resend. Schema sentinel 0xC0DE0009 → 0xC0DE000A; old files clamp to the default. - When a pending on-device DM passes its ACK deadline, tickDmResends() (driven from UITask::loop, so it runs in the background regardless of the active screen) re-sends with the next attempt# reusing the original timestamp, refreshing ack_tag/deadline, until resends run out → then ✗. - dmEffectiveStatus keeps the entry pending while resends remain. Incoming DM dedup: - A retry reuses the sender timestamp + text but has a fresh packet hash, so the mesh dup-filter passes it. addDMMsg now takes sender_timestamp and drops copies matching prefix+timestamp+text. sender_timestamp plumbed from MyMesh::queueMessage through AbstractUITask/UITask. Channel relay ring: - Replace the single-slot relayed-into-mesh tracker with a 4-slot ring so a quick burst of channel sends are each matched to their repeater echo. Receive-path hashing still gated (now on _relay_active) so the hot flood path is untouched when idle. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>