Add deterministic server-side chapter detection for starts, flag periods, pit phases, decisive top-five swings, and finishes, then expose chapters on the race-hub payload.
Spike result: race-hub already loads race control, positions, and laps in one read model. The requested Detect signature does not include pit stops, so pit phases use IsPitOutLap clusters as the local deterministic pit-stop proxy.
Replace the static weekend band with a three-state hero (live, upcoming,
between weekends) driven by heroState() and existing page queries. Between-weekend
podium uses the existing race-hub endpoint for the last ingested race session
since championship hub does not expose finish positions.
Co-authored-by: Cursor <cursoragent@cursor.com>
