Add startup persistence for support sessions

- Added startup.rs module for Windows registry operations
- Agent adds itself to HKCU\...\Run on session start
- Agent removes itself from startup on session end
- Works with user-level registry (no admin required)
- Added Win32_System_Registry feature to windows crate

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

agent/src/main.rs

@@ -13,6 +13,7 @@ mod config;
 mod encoder;
 mod input;
 mod session;
+mod startup;
 mod transport;
 mod tray;
 
@@ -162,12 +163,29 @@ async fn main() -> Result<()> {
     Ok(())
 }
 
+/// Clean up before exiting (remove from startup, etc.)
+fn cleanup_on_exit(is_support_session: bool) {
+    if is_support_session {
+        info!("Cleaning up before exit");
+        if let Err(e) = startup::remove_from_startup() {
+            warn!("Failed to remove from startup: {}", e);
+        }
+    }
+}
+
 async fn run_agent(config: config::Config) -> Result<()> {
     // Create session manager
     let mut session = session::SessionManager::new(config.clone());
     let is_support_session = config.support_code.is_some();
     let hostname = config.hostname();
 
+    // Add to startup so we reconnect after reboot
+    if is_support_session {
+        if let Err(e) = startup::add_to_startup() {
+            warn!("Failed to add to startup: {}. Agent won't persist through reboot.", e);
+        }
+    }
+
     // Create tray icon
     let tray = match tray::TrayController::new(&hostname, config.support_code.as_deref()) {
         Ok(t) => {
@@ -208,12 +226,14 @@ async fn run_agent(config: config::Config) -> Result<()> {
                     // Check if this is a user-initiated exit
                     if error_msg.contains("USER_EXIT") {
                         info!("Session ended by user");
+                        cleanup_on_exit(is_support_session);
                         return Ok(());
                     }
 
                     // Check if this is a cancellation
                     if error_msg.contains("SESSION_CANCELLED") {
                         info!("Session was cancelled by technician");
+                        cleanup_on_exit(is_support_session);
                         show_message_box(
                             "Support Session Ended",
                             "The support session was cancelled by the technician.\n\nThis window will close automatically.",
@@ -231,6 +251,7 @@ async fn run_agent(config: config::Config) -> Result<()> {
                 // Check if connection was rejected due to cancelled code
                 if error_msg.contains("cancelled") {
                     info!("Support code was cancelled before connection");
+                    cleanup_on_exit(is_support_session);
                     show_message_box(
                         "Support Session Cancelled",
                         "This support session has been cancelled.\n\nPlease contact your technician for a new support code.",
@@ -246,6 +267,7 @@ async fn run_agent(config: config::Config) -> Result<()> {
         // For support sessions, don't reconnect if something goes wrong
         if is_support_session {
             info!("Support session ended, not reconnecting");
+            cleanup_on_exit(is_support_session);
             return Ok(());
         }
 
@@ -253,6 +275,7 @@ async fn run_agent(config: config::Config) -> Result<()> {
         if let Some(ref t) = tray {
             if t.exit_requested() {
                 info!("Exit requested by user");
+                cleanup_on_exit(is_support_session);
                 return Ok(());
             }
         }