chore: AI lab accounts filter — hard news only, drop everything else

HEARTBEAT.md

@@ -223,7 +223,7 @@ Use: `bird user-tweets @handle` → filter for posts newer than last scan timest
 - New AI model releases (open-weight, frontier, pricing changes)
 - Breaking political move with broad economic impact
 - NABL acquisition/PE news
-- @openclaw or @moltbot announcing a release
+- @openclaw or @steipete announcing a release
 
 **Post to dashboard, no ping:**
 - Interesting tech commentary worth reading
@@ -232,8 +232,9 @@ Use: `bird user-tweets @handle` → filter for posts newer than last scan timest
 
 **Drop silently:**
 - Retweets of old news
-- Promotional content
-- Engagement bait
+- Promotional content, event promos, partnership announcements
+- Engagement bait, opinion threads, personal posts
+- Anything from @OpenAI/@MiniMax_AI/@Kimi_Moonshot/@ZhipuAI/@Gemini that isn't a model release, pricing change, or major product launch — these accounts post constantly, only hard news counts
 
 ### Subagent reports back with
 - Count of new posts checked