Previously the bot seeded all existing feed items on startup WITHOUT posting, so a
freshly-created channel stayed empty and new subscribers saw nothing (only items
appearing after start were posted). Now on first run it posts the latest items
(max 5) to fill the channel — recent history then shows them to joiners — and sets
an rss_populated flag so restarts don't replay. Existing (empty) bots get filled
once on next start. Update rss_test.py.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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