The MIN_CONTEXT_MESSAGES fallback (pull 3 most recent history
messages when unread < 3) was injecting already-read historical
messages into the MessagingStyle. On Android Auto, Gearhead reads
every message in the style aloud and shows them stacked on the
HUN, so old context was announced alongside the new one.
Just show the unread messages (up to MAX_HISTORY_MESSAGES). If
nothing is unread, don't post at all — we only call this from
paths that already check for fresh inbound content.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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