Add atomic circuit update commands

src/domain/errors/project-revision-conflict.error.ts

@@ -0,0 +1,14 @@
+export class ProjectRevisionConflictError extends Error {
+  constructor(
+    readonly projectId: string,
+    readonly expectedRevision: number,
+    readonly actualRevision: number | null
+  ) {
+    super(
+      actualRevision === null
+        ? `Project ${projectId} does not exist.`
+        : `Project ${projectId} is at revision ${actualRevision}, expected ${expectedRevision}.`
+    );
+    this.name = "ProjectRevisionConflictError";
+  }
+}