chore: remove debugging infrastructure after permission fixes

Removes temporary debugging docs and excessive logging that were added to diagnose and fix permission modal issues.

Cleaned up:
- Deleted DEBUGGING.md (temporary troubleshooting guide)
- Deleted FIXES-2026-02-06.md (temporary fix summary)
- Removed debug logging from all Rust modules

src-tauri/src/wsl_notifications.rs

@@ -48,15 +48,15 @@ $notifier.Show($toast)
     match output {
         Ok(result) => {
             if result.status.success() {
-                println!("WSL notification sent successfully");
+                tracing::info!("WSL notification sent successfully");
                 return Ok(());
             } else {
                 let stderr = String::from_utf8_lossy(&result.stderr);
-                println!("PowerShell toast failed: {}", stderr);
+                tracing::error!("PowerShell toast failed: {}", stderr);
             }
         }
         Err(e) => {
-            println!("Failed to run PowerShell: {}", e);
+            tracing::error!("Failed to run PowerShell: {}", e);
         }
     }
 
@@ -74,7 +74,7 @@ $notifier.Show($toast)
 
     if let Ok(result) = notify_result {
         if result.status.success() {
-            println!("Notification sent via wsl-notify-send");
+            tracing::info!("Notification sent via wsl-notify-send");
             return Ok(());
         }
     }