Offer Claude sign-in from failed sessions

server/src/session/driver.rs

@@ -440,6 +440,14 @@ pub enum Event {
         #[serde(default, skip_serializing_if = "Option::is_none")]
         resets_at: Option<f64>,
     },
+    /// The provider refused the turn because its login can no longer be used.
+    ///
+    /// Recognised by the driver for the same reason [`Event::LimitReached`] is:
+    /// only that layer knows the provider's dialect, and the phone needs a
+    /// state it can act on without matching error prose.
+    AuthenticationRequired {
+        message: String,
+    },
     Error {
         message: String,
     },