Module executor 

Single BDD execution engine for all consumers (TestRunner, MCP, standalone).

ScenarioExecutor handles step matching, hooks, variable interpolation, timeouts, and result collection. An optional StepObserver allows callers to receive per-step events in real-time (TestInfo reporting in the test runner, progress notifications in MCP, etc.).

Structs

ScenarioExecutor

Executes BDD scenarios and individual steps without requiring the TestRunner or FixturePool.

StepEvent

Per-step event emitted during scenario execution.

Traits

StepObserver

Callback for observing step execution in real-time.