# `WorkflowStem.Engines.FlowEngine`
[🔗](https://github.com/fosferon/workflow_stem/blob/main/lib/workflow_stem/engines/flow_engine.ex#L1)

ALF-backed engine for `:flow` workflows.

Flow workflows are pure data pipelines: they accept arbitrary input events and
run a sequence of transformations, producing a result and accumulating trace.

The `:flow` profile intentionally does not provide FSM-style state gating.

# `runtime`

```elixir
@type runtime() :: %{
  :execution_id => String.t(),
  :tenant_id => String.t(),
  :spec => map(),
  optional(:context) => map(),
  optional(:trace) => list(),
  optional(:blocked_reasons) => map(),
  optional(:breakpoint_hits) => list(),
  optional(:last_event) => {term(), term()} | nil,
  optional(:last_result) => term(),
  optional(:errors) => [map()],
  optional(:projection) => WorkflowStem.Projection.t()
}
```

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*Consult [api-reference.md](api-reference.md) for complete listing*