feat: scaffold agentic interior design workflow

services/api/tests/test_workflow.py

@@ -0,0 +1,45 @@
+import pytest
+
+from app.domain.models import CommandRequest, WorkflowCommand, WorkflowStage
+from app.domain.workflow import InvalidTransitionError, WorkflowConflictError, apply_command
+from app.repositories.memory import create_demo_project
+
+
+def test_confirm_plan_advances_revision_and_stage() -> None:
+    project = create_demo_project()
+    updated = apply_command(
+        project,
+        CommandRequest(
+            command=WorkflowCommand.CONFIRM_PLAN,
+            expected_revision=project.revision,
+            payload={"ceiling_height_mm": 2900},
+        ),
+    )
+
+    assert updated.stage == WorkflowStage.BLOCKOUT
+    assert updated.revision == project.revision + 1
+    assert updated.plan.ceiling_height_mm == 2900
+
+
+def test_stale_revision_is_rejected() -> None:
+    project = create_demo_project()
+    with pytest.raises(WorkflowConflictError):
+        apply_command(
+            project,
+            CommandRequest(
+                command=WorkflowCommand.CONFIRM_PLAN,
+                expected_revision=project.revision - 1,
+            ),
+        )
+
+
+def test_invalid_command_is_rejected() -> None:
+    project = create_demo_project()
+    with pytest.raises(InvalidTransitionError):
+        apply_command(
+            project,
+            CommandRequest(
+                command=WorkflowCommand.REQUEST_RENDER,
+                expected_revision=project.revision,
+            ),
+        )