[eric] island: stop counting the workflow Edit Agent as one of the user's finished agents

frontend/src/shared/state/isUserLaunchedSession.ts

@@ -0,0 +1,14 @@
+// Plumbing chats the UI spins up for itself: a workflow card's Edit Agent, a workflow run, a browser
+// or sub agent working for a parent. They are real sessions, they just aren't things the user started.
+const PLUMBING_MODES: ReadonlySet<string> = new Set(['browser-agent', 'invoked-agent', 'sub-agent']);
+
+export interface SessionOrigin {
+  mode: string;
+  workflow_run_id?: string | null;
+  workflow_edit_id?: string | null;
+}
+
+/** True for a chat the user started themselves, which is the only kind that earns a card or a notification. */
+export function isUserLaunchedSession(session: SessionOrigin): boolean {
+  return !session.workflow_run_id && !session.workflow_edit_id && !PLUMBING_MODES.has(session.mode);
+}