Envelope

Derived events carry the input's envelope (openspec pubsub-topics, "Envelope on a derived event") unless the worker sets a field explicitly.

output.WithCorrelationId(input)
      .WithScenarioId("S7F3A9B")
      .WithTimestamp()
      .WithEventTime(candle.WindowEnd);

Helper	Attribute
`WithCorrelationId` / `GetCorrelationId`	`correlationid`
`WithScenarioId` / `GetScenarioId`	`scenarioid`
`WithRunId` / `GetRunId`	`runid`
`WithExchange` / `GetExchange`	`exchange`
`WithClockType` / `GetClockType`	`clocktype`
`WithEventTime` / `GetEventTime`	`eventtime`
`WithWallTime` / `GetWallTime`	`walltime`
`WithMarketWorld` / `GetMarketWorld`	`marketworld`
`WithMarketUniverse` / `GetMarketUniverse`	`marketuniverse`
`WithPortfolioWorld` / `GetPortfolioWorld`	`portfolioworld`
`WithStrategyWorld` / `GetStrategyWorld`	`strategyworld`

EnvelopeAttributes.Carried lists the attributes a derived event inherits.