Add SAS Service for Ctrl+Alt+Del support

- New guruconnect-sas-service binary (runs as SYSTEM)
- Named pipe IPC for agent-to-service communication
- Multi-tier SAS approach: service > sas.dll > fallback
- Service auto-install/uninstall helpers in startup.rs

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

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

agent/src/startup.rs

@@ -177,6 +177,93 @@ pub fn uninstall() -> Result<()> {
     Ok(())
 }
 
+/// Install the SAS service if the binary is available
+/// This allows the agent to send Ctrl+Alt+Del even without SYSTEM privileges
+#[cfg(windows)]
+pub fn install_sas_service() -> Result<()> {
+    info!("Attempting to install SAS service...");
+
+    // Check if the SAS service binary exists alongside the agent
+    let exe_path = std::env::current_exe()?;
+    let exe_dir = exe_path.parent().ok_or_else(|| anyhow::anyhow!("No parent directory"))?;
+    let sas_binary = exe_dir.join("guruconnect-sas-service.exe");
+
+    if !sas_binary.exists() {
+        // Also check in Program Files
+        let program_files = std::path::PathBuf::from(r"C:\Program Files\GuruConnect\guruconnect-sas-service.exe");
+        if !program_files.exists() {
+            warn!("SAS service binary not found");
+            return Ok(());
+        }
+    }
+
+    // Run the install command
+    let sas_path = if sas_binary.exists() {
+        sas_binary
+    } else {
+        std::path::PathBuf::from(r"C:\Program Files\GuruConnect\guruconnect-sas-service.exe")
+    };
+
+    let output = std::process::Command::new(&sas_path)
+        .arg("install")
+        .output();
+
+    match output {
+        Ok(result) => {
+            if result.status.success() {
+                info!("SAS service installed successfully");
+            } else {
+                let stderr = String::from_utf8_lossy(&result.stderr);
+                warn!("SAS service install failed: {}", stderr);
+            }
+        }
+        Err(e) => {
+            warn!("Failed to run SAS service installer: {}", e);
+        }
+    }
+
+    Ok(())
+}
+
+/// Uninstall the SAS service
+#[cfg(windows)]
+pub fn uninstall_sas_service() -> Result<()> {
+    info!("Attempting to uninstall SAS service...");
+
+    // Try to find and run the uninstall command
+    let paths = [
+        std::env::current_exe().ok().and_then(|p| p.parent().map(|d| d.join("guruconnect-sas-service.exe"))),
+        Some(std::path::PathBuf::from(r"C:\Program Files\GuruConnect\guruconnect-sas-service.exe")),
+    ];
+
+    for path_opt in paths.iter() {
+        if let Some(ref path) = path_opt {
+            if path.exists() {
+                let output = std::process::Command::new(path)
+                    .arg("uninstall")
+                    .output();
+
+                if let Ok(result) = output {
+                    if result.status.success() {
+                        info!("SAS service uninstalled successfully");
+                        return Ok(());
+                    }
+                }
+            }
+        }
+    }
+
+    warn!("SAS service binary not found for uninstall");
+    Ok(())
+}
+
+/// Check if the SAS service is installed and running
+#[cfg(windows)]
+pub fn check_sas_service() -> bool {
+    use crate::sas_client;
+    sas_client::is_service_available()
+}
+
 #[cfg(not(windows))]
 pub fn add_to_startup() -> Result<()> {
     warn!("Startup persistence not implemented for this platform");
@@ -193,3 +280,19 @@ pub fn uninstall() -> Result<()> {
     warn!("Uninstall not implemented for this platform");
     Ok(())
 }
+
+#[cfg(not(windows))]
+pub fn install_sas_service() -> Result<()> {
+    warn!("SAS service only available on Windows");
+    Ok(())
+}
+
+#[cfg(not(windows))]
+pub fn uninstall_sas_service() -> Result<()> {
+    Ok(())
+}
+
+#[cfg(not(windows))]
+pub fn check_sas_service() -> bool {
+    false
+}