Make restart reconnect persistent

src/config.rs

@@ -48,16 +48,9 @@ pub struct ServerConfig {
     pub allow_agent_forwarding: bool,
     #[serde(default = "default_accept_env")]
     pub accept_env: Vec<String>,
-    /// Run each terminal session's shell under a small per-session *holder*
-    /// process so it survives a `dosh-server` restart (crash/upgrade/
-    /// `systemctl restart`). On startup the server re-adopts live holders and
-    /// reattaching clients land on the same shell with screen state intact. When
-    /// `false`, sessions behave exactly as before: the shell is a child of the
-    /// server and dies with it.
-    // Opt-in for now: this changes the core session model (per-session holder
-    // processes + fd passing), so it stays OFF by default until it has been
-    // stress-tested on a real host. Set `persist_sessions = true` to enable.
-    #[serde(default)]
+    /// Run terminal sessions under per-session holder processes so shells
+    /// survive a quick `dosh-server` restart and clients can reconnect.
+    #[serde(default = "default_true")]
     pub persist_sessions: bool,
 }
 
@@ -90,7 +83,7 @@ impl Default for ServerConfig {
             allow_remote_non_loopback_bind: false,
             allow_agent_forwarding: false,
             accept_env: default_accept_env(),
-            persist_sessions: false,
+            persist_sessions: true,
         }
     }
 }