kaintuck: connection indicator only (drop redundant gossip feed)

#55 in Riparion/riparion-retro — merged 2026-06-15

Narrows the previous change: the SharedMarket bar shows only the shared-market connection indicator. Trader gossip already comes through the engine's normal travel banter, so the separate live gossip feed (and its RemoteMarket::gossip_log buffer) is removed. Bumps kaintuck 0.1.25 → 0.1.26.

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