Macro workflow 

workflow!() { /* proc-macro */ }

Builds a workflow pipeline with a concise DSL.

Syntax

workflow!("workflow-id", CodecType, registry_expr,
    step => step => step
)

Step Types

• task_name — reference to a #[task]-generated struct
• name(param: Type) { expr } — inline task
• step || step — parallel fork (branches)
• delay "5s" — durable delay (auto-generated ID)
• delay "wait_24h" "5s" — durable delay with custom ID
• => — sequential chain (or join after ||)

Returns

A Result<SerializableWorkflow<C, Input, ()>, WorkflowError> expression.