Workflow Invocation States Diagram

Main Path

Steps move Triggered, Running, Logged, Gate, Done
The gate pins old histories to their own code version
Done means every step result is in the durable log

Retry

A crash returns to Running with the same step id
Logged results are reused, never re-run
Spent retry budget ends as Failed

Terminal

Irrecoverable failure compensates forward, never rolls back time
Compensated is terminal: undo done, effects settled
Order, branch or payload changes ship as a new version