Перенес workflow

src/app_runtime/workflow/contracts/__init__.py

@@ -0,0 +1 @@
+__all__: list[str] = []

src/app_runtime/workflow/contracts/context.py

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+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass(slots=True)
+class WorkflowContext:
+    payload: dict[str, Any]
+    state: dict[str, Any] = field(default_factory=dict)
+
+    def snapshot(self) -> dict[str, Any]:
+        return {
+            "payload": dict(self.payload),
+            "state": dict(self.state),
+        }

src/app_runtime/workflow/contracts/result.py

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+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass(slots=True)
+class StepResult:
+    transition: str = "success"
+    updates: dict[str, Any] = field(default_factory=dict)
+    status: str = "completed"

src/app_runtime/workflow/contracts/step.py

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+from __future__ import annotations
+
+from abc import ABC, abstractmethod
+
+from app_runtime.workflow.contracts.context import WorkflowContext
+from app_runtime.workflow.contracts.result import StepResult
+
+
+class WorkflowStep(ABC):
+    @abstractmethod
+    def run(self, context: WorkflowContext) -> StepResult:
+        """Run the step and return transition metadata."""

src/app_runtime/workflow/contracts/workflow.py

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+from __future__ import annotations
+
+from dataclasses import dataclass, field
+
+from app_runtime.workflow.contracts.step import WorkflowStep
+
+
+@dataclass(slots=True)
+class WorkflowNode:
+    name: str
+    step: WorkflowStep
+    transitions: dict[str, str] = field(default_factory=dict)
+
+
+@dataclass(slots=True)
+class WorkflowDefinition:
+    name: str
+    start_at: str
+    nodes: dict[str, WorkflowNode]