Returns conventional and off-hours session state plus per-asset tradability derived from the enriched public asset universe and cached session limits. During off-hours, isOpen remains the conventional-session flag while offhoursIsOpen and assetTradability identify the active venue and eligible assets. When fully closed, tradability is computed for the next opening session. This is public-safe: it exposes session names and booleans without raw upstream payloads or private route details.