add context window monitor

Writes the current context window to logs/current_context_window (uses a symlink to a session ID).

This PR was unfortunately generated by a different LLM and did a ton of superficial reformating, it's actually a fairly small and benign change, but I don't want to roll back everything. Hope that's ok.

crates/g3-computer-control/examples/test_vision.rs

@@ -1,63 +1,67 @@
-use g3_computer_control::ocr::{OCREngine, DefaultOCR};
 use anyhow::Result;
+use g3_computer_control::ocr::{DefaultOCR, OCREngine};
 
 #[tokio::main]
 async fn main() -> Result<()> {
     println!("🧪 Testing Apple Vision OCR");
     println!("===========================\n");
-    
+
     // Initialize OCR engine
     println!("📦 Initializing OCR engine...");
     let ocr = DefaultOCR::new()?;
     println!("✅ OCR engine: {}\n", ocr.name());
-    
+
     // Check if test image exists
     let test_image = "/tmp/safari_test.png";
     if !std::path::Path::new(test_image).exists() {
         println!("⚠️  Test image not found: {}", test_image);
         println!("   Creating a screenshot...");
-        
+
         let status = std::process::Command::new("screencapture")
             .arg("-x")
             .arg("-R")
             .arg("0,0,1200,800")
             .arg(test_image)
             .status()?;
-        
+
         if !status.success() {
             anyhow::bail!("Failed to create screenshot");
         }
-        
+
         println!("✅ Screenshot created\n");
     }
-    
+
     // Run OCR
     println!("🔍 Running Apple Vision OCR on {}...", test_image);
     let start = std::time::Instant::now();
     let locations = ocr.extract_text_with_locations(test_image).await?;
     let duration = start.elapsed();
-    
+
     println!("✅ OCR completed in {:.3}s\n", duration.as_secs_f64());
-    
+
     // Display results
     println!("📊 Results:");
     println!("   Found {} text elements\n", locations.len());
-    
+
     if locations.is_empty() {
         println!("⚠️  No text found in image");
     } else {
         println!("   Top 20 results:");
-        println!("   {:<4} {:<40} {:<15} {:<12} {:<8}", "#", "Text", "Position", "Size", "Conf");
+        println!(
+            "   {:<4} {:<40} {:<15} {:<12} {:<8}",
+            "#", "Text", "Position", "Size", "Conf"
+        );
         println!("   {}", "-".repeat(85));
-        
+
         for (i, loc) in locations.iter().take(20).enumerate() {
             let text = if loc.text.len() > 37 {
                 format!("{}...", &loc.text[..37])
             } else {
                 loc.text.clone()
             };
-            
-            println!("   {:<4} {:<40} ({:>4},{:>4})    {:>4}x{:<4}  {:.2}",
+
+            println!(
+                "   {:<4} {:<40} ({:>4},{:>4})    {:>4}x{:<4}  {:.2}",
                 i + 1,
                 text,
                 loc.x,
@@ -67,19 +71,22 @@ async fn main() -> Result<()> {
                 loc.confidence
             );
         }
-        
+
         if locations.len() > 20 {
             println!("\n   ... and {} more", locations.len() - 20);
         }
-        
+
         // Performance comparison
         println!("\n📈 Performance:");
         println!("   OCR Speed: {:.3}s", duration.as_secs_f64());
         println!("   Text elements: {}", locations.len());
-        println!("   Avg per element: {:.1}ms", duration.as_millis() as f64 / locations.len() as f64);
+        println!(
+            "   Avg per element: {:.1}ms",
+            duration.as_millis() as f64 / locations.len() as f64
+        );
     }
-    
+
     println!("\n✅ Test complete!");
-    
+
     Ok(())
 }