Add UAC elevation support with manifest

- Added guruconnect.manifest requesting highestAvailable privileges
- Using winres to embed manifest in executable
- Added is_elevated() function to detect admin status
- Logs elevation status on startup
- Manifest includes Windows 7-11 compatibility

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

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

agent/src/main.rs

@@ -28,6 +28,10 @@ use tracing_subscriber::FmtSubscriber;
 use windows::Win32::UI::WindowsAndMessaging::{MessageBoxW, MB_OK, MB_ICONINFORMATION};
 #[cfg(windows)]
 use windows::core::PCWSTR;
+#[cfg(windows)]
+use windows::Win32::Security::{GetTokenInformation, TokenElevation, TOKEN_ELEVATION, TOKEN_QUERY};
+#[cfg(windows)]
+use windows::Win32::System::Threading::{GetCurrentProcess, OpenProcessToken};
 
 /// Extract a 6-digit support code from the executable's filename.
 /// Looks for patterns like "GuruConnect-123456.exe" or "123456.exe"
@@ -56,6 +60,38 @@ fn extract_code_from_filename() -> Option<String> {
     None
 }
 
+/// Check if the process is running with elevated privileges (Windows only)
+#[cfg(windows)]
+fn is_elevated() -> bool {
+    unsafe {
+        let mut token_handle = windows::Win32::Foundation::HANDLE::default();
+        if OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &mut token_handle).is_err() {
+            return false;
+        }
+
+        let mut elevation = TOKEN_ELEVATION::default();
+        let mut size = std::mem::size_of::<TOKEN_ELEVATION>() as u32;
+
+        let result = GetTokenInformation(
+            token_handle,
+            TokenElevation,
+            Some(&mut elevation as *mut _ as *mut _),
+            size,
+            &mut size,
+        );
+
+        let _ = windows::Win32::Foundation::CloseHandle(token_handle);
+
+        result.is_ok() && elevation.TokenIsElevated != 0
+    }
+}
+
+#[cfg(not(windows))]
+fn is_elevated() -> bool {
+    // On non-Windows, check if running as root
+    unsafe { libc::geteuid() == 0 }
+}
+
 /// Show a message box to the user (Windows only)
 #[cfg(windows)]
 fn show_message_box(title: &str, message: &str) {
@@ -98,6 +134,13 @@ async fn main() -> Result<()> {
 
     info!("GuruConnect Agent v{}", env!("CARGO_PKG_VERSION"));
 
+    // Check and log elevation status
+    if is_elevated() {
+        info!("Running with elevated (administrator) privileges");
+    } else {
+        info!("Running with standard user privileges");
+    }
+
     // Extract support code from executable filename
     // e.g., GuruConnect-123456.exe -> 123456
     let support_code = extract_code_from_filename();