Live SSE stream of price deltas, whale prints and resolutions

Keyless Server-Sent Events stream. One connection delivers three named event types, each a JSON payload:

• deltas — top snapshot price-deltas since the previous tick ({at, deltas:[{source, slug, title, priceChange24h, volume24h, capturedAt}]})
• whale — newly observed verified large trades (same trade shape as /api/prediction-markets/whales; {at, trades:[...]})
• resolution — freshly resolved events ({at, resolutions:[{source, slug, title, resolutionState, resolvedAt}]})

Comment heartbeats (: hb <iso>) arrive roughly every 15 seconds — treat a silence much longer than that as a dead connection and reconnect (a retry: 5000 hint is sent on connect). Feeds tick at a 15-second cadence; a row is delivered at most once per server poller session. This is an information feed, not a recommendation stream.