Implemented foundation of task-flow-engine

flows/workstream.yaml

@@ -0,0 +1,45 @@
+id: custodian.workstream.v1
+entity_type: workstream
+workstations:
+  - name: todo
+    description: Planned but not yet active.
+    entry_assertions: []
+    exit_assertions: []
+  - name: active
+    description: Work is underway.
+    entry_assertions: []
+    exit_assertions:
+      - id: dependencies.all_complete
+        target: dependencies.*.workstation
+        op: all_eq
+        value: completed
+        description: Dependency workstreams have reached completed.
+  - name: blocked
+    description: Work is blocked by incomplete dependencies or missing input.
+    entry_assertions:
+      - id: dependencies.any_incomplete
+        target: dependencies.*.workstation
+        op: custom
+        value: completed
+        description: At least one dependency is not completed.
+    exit_assertions:
+      - id: dependencies.all_complete
+        target: dependencies.*.workstation
+        op: all_eq
+        value: completed
+        description: All dependency workstreams have reached completed.
+  - name: completed
+    description: Work is complete.
+    entry_assertions:
+      - id: tasks.all_done
+        target: tasks.*.status
+        op: all_eq
+        value:
+          - done
+          - cancelled
+        description: All child tasks are done or cancelled.
+    exit_assertions: []
+  - name: archived
+    description: Completed work has been moved out of the active set.
+    entry_assertions: []
+    exit_assertions: []