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/safari_demo.rs

@@ -1,64 +1,66 @@
-use g3_computer_control::SafariDriver;
-use g3_computer_control::webdriver::WebDriverController;
 use anyhow::Result;
+use g3_computer_control::webdriver::WebDriverController;
+use g3_computer_control::SafariDriver;
 
 #[tokio::main]
 async fn main() -> Result<()> {
     println!("Safari WebDriver Demo");
     println!("=====================\n");
-    
+
     println!("Make sure to:");
     println!("1. Enable 'Allow Remote Automation' in Safari's Develop menu");
     println!("2. Run: /usr/bin/safaridriver --enable");
     println!("3. Start safaridriver in another terminal: safaridriver --port 4444\n");
-    
+
     println!("Connecting to SafariDriver...");
     let mut driver = SafariDriver::new().await?;
     println!("✅ Connected!\n");
-    
+
     // Navigate to a website
     println!("Navigating to example.com...");
     driver.navigate("https://example.com").await?;
     println!("✅ Navigated\n");
-    
+
     // Get page title
     let title = driver.title().await?;
     println!("Page title: {}\n", title);
-    
+
     // Get current URL
     let url = driver.current_url().await?;
     println!("Current URL: {}\n", url);
-    
+
     // Find an element
     println!("Finding h1 element...");
     let h1 = driver.find_element("h1").await?;
     let h1_text = h1.text().await?;
     println!("H1 text: {}\n", h1_text);
-    
+
     // Find all paragraphs
     println!("Finding all paragraphs...");
     let paragraphs = driver.find_elements("p").await?;
     println!("Found {} paragraphs\n", paragraphs.len());
-    
+
     // Get page source
     println!("Getting page source...");
     let source = driver.page_source().await?;
     println!("Page source length: {} bytes\n", source.len());
-    
+
     // Execute JavaScript
     println!("Executing JavaScript...");
-    let result = driver.execute_script("return document.title", vec![]).await?;
+    let result = driver
+        .execute_script("return document.title", vec![])
+        .await?;
     println!("JS result: {:?}\n", result);
-    
+
     // Take a screenshot
     println!("Taking screenshot...");
     driver.screenshot("/tmp/safari_demo.png").await?;
     println!("✅ Screenshot saved to /tmp/safari_demo.png\n");
-    
+
     // Close the browser
     println!("Closing browser...");
     driver.quit().await?;
     println!("✅ Done!");
-    
+
     Ok(())
 }