chore: Fix lint warnings, format code, and update documentation

- Add #[allow(clippy::too_many_arguments)] for establish_connection function
- Apply cargo fmt formatting fixes
- Add interactive mode + keepalive example to README and manpage

Author: inureyes

README.md

@@ -1241,6 +1241,9 @@ bssh -H server1,server2 interactive --prompt-format "{user}@{host}> "
 
 # Set initial working directory
 bssh -C staging interactive --work-dir /var/www
+
+# Interactive mode with keepalive for long-running sessions (e.g., tmux)
+bssh -C production --server-alive-interval 30 --server-alive-count-max 5 interactive
 ```
 
 #### Interactive Mode Configuration

docs/man/bssh.1

@@ -1581,6 +1581,14 @@ Interactive mode with initial working directory:
 Sets initial working directory to /var/www on all nodes
 .RE
 
+.TP
+Interactive mode with keepalive for long-running sessions:
+.B bssh -C production --server-alive-interval 30 --server-alive-count-max 5 interactive
+.RS
+Configure SSH keepalive settings to prevent idle disconnection in long-running sessions (e.g., tmux).
+The keepalive settings apply to both the destination host and any jump hosts in the connection chain.
+.RE
+
 .SS Exit Code Handling Examples (v1.2.0+)
 
 .TP

src/commands/interactive/connection.rs

@@ -39,6 +39,7 @@ impl InteractiveCommand {
     /// and retry with password authentication (matching OpenSSH behavior).
     ///
     /// The `ssh_config` parameter allows configuring SSH connection settings like keepalive intervals.
+    #[allow(clippy::too_many_arguments)]
     async fn establish_connection(
         addr: (&str, u16),
         username: &str,

src/pty/session/session_manager.rs

@@ -301,8 +301,7 @@ impl PtySession {
 
         // Track last activity time for connection health monitoring
         let mut last_activity = std::time::Instant::now();
-        let health_check_interval =
-            Duration::from_secs(CONNECTION_HEALTH_CHECK_INTERVAL_SECS);
+        let health_check_interval = Duration::from_secs(CONNECTION_HEALTH_CHECK_INTERVAL_SECS);
         let max_idle_time = Duration::from_secs(MAX_IDLE_TIME_BEFORE_WARNING_SECS);
         let mut idle_warning_shown = false;
 

src/ssh/ssh_config/mod.rs

@@ -212,11 +212,10 @@ impl SshConfig {
         {
             // Check if there's at least a matching host pattern
             // If not, this alias doesn't exist in SSH config
-            let has_matching_pattern = self.hosts.iter().any(|h| {
-                h.host_patterns
-                    .iter()
-                    .any(|p| p == host_alias || p == "*")
-            });
+            let has_matching_pattern = self
+                .hosts
+                .iter()
+                .any(|h| h.host_patterns.iter().any(|p| p == host_alias || p == "*"));
 
             if !has_matching_pattern {
                 return None;

tests/jump_host_config_test.rs

@@ -690,7 +690,12 @@ clusters:
                 .unwrap()
                 .is_ssh_config_ref());
             assert_eq!(
-                cluster.defaults.jump_host.as_ref().unwrap().ssh_config_host(),
+                cluster
+                    .defaults
+                    .jump_host
+                    .as_ref()
+                    .unwrap()
+                    .ssh_config_host(),
                 Some("bastion")
             );
         }

tests/ssh_keepalive_test.rs

@@ -683,8 +683,7 @@ fn test_interactive_mode_ssh_connection_config_default() {
         "InteractiveCommand should have default keepalive interval"
     );
     assert_eq!(
-        cmd.ssh_connection_config.keepalive_max,
-        DEFAULT_KEEPALIVE_MAX,
+        cmd.ssh_connection_config.keepalive_max, DEFAULT_KEEPALIVE_MAX,
         "InteractiveCommand should have default keepalive max"
     );
 }
@@ -806,17 +805,16 @@ fn test_jump_host_chain_with_ssh_connection_config() {
         .with_keepalive_max(5);
 
     // JumpHostChain should accept the config via builder pattern
-    let _chain = JumpHostChain::direct()
-        .with_ssh_connection_config(ssh_config);
+    let _chain = JumpHostChain::direct().with_ssh_connection_config(ssh_config);
 
     // If we got here without panicking, the config was accepted correctly
 }
 
 #[test]
 fn test_jump_host_chain_with_custom_keepalive_for_long_running_sessions() {
     // Test real-world use case: long-running sessions need longer keepalive
-    use bssh::jump::JumpHostChain;
     use bssh::jump::parser::JumpHost;
+    use bssh::jump::JumpHostChain;
     use std::time::Duration;
 
     // For long-running interactive sessions, use longer keepalive intervals