feat: implement unified local launch failure handling policy

cli/src/agent/localLaunchPolicy.ts

@@ -0,0 +1,16 @@
+export type StartedBy = 'daemon' | 'terminal';
+
+export type LocalLaunchExitReason = 'switch' | 'exit';
+
+export type LocalLaunchContext = {
+    startedBy?: StartedBy;
+    startingMode?: 'local' | 'remote';
+};
+
+export function getLocalLaunchExitReason(context: LocalLaunchContext): LocalLaunchExitReason {
+    if (context.startedBy === 'daemon' || context.startingMode === 'remote') {
+        return 'switch';
+    }
+
+    return 'exit';
+}