Generates ash_state_machine configuration from workflow steps.

Injects the following into the resource's state_machine DSL:

• state_attribute — the workflow's state_attribute, when it declares one.
• initial_states — set to the step with initial: true, or the first non-terminal step by declaration order if none is marked.
• default_initial_state — same as above
• Transitions for each step type:
  • Automatic steps — transition :step_action, from: [:step_name], to: [...], where to is every target across the step's on_success entries. If on_error is set, a transition named __on_error_<step> to the error state is added — declared on the error handler action rather than on the step's own action, since that is what AshOban invokes when the step fails.
  • Manual steps — one transition per declared transition entity, e.g. transition :approve, from: [:review], to: [:approved]
  • Undoable transitions — when the workflow declares an undo block, two :undo transitions per undoable edge, one in each direction, so both a rewind and a subsequent redo are permitted.
  • Timeouts with transition_to — a transition named __timeout_<step>_<name>, e.g. transition :__timeout_review_escalation, from: [:review], to: [:escalated]

Must run before all AshStateMachine.Transformers.* so that the state machine extension sees the generated states and transitions.