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-providers/tests/cache_control_integration_test.rs

@@ -10,13 +10,19 @@ use serde_json::json;
 fn test_ephemeral_cache_control_serialization() {
     let cache_control = CacheControl::ephemeral();
     let json = serde_json::to_value(&cache_control).unwrap();
-    
-    println!("Ephemeral cache_control JSON: {}", serde_json::to_string(&json).unwrap());
-    
-    assert_eq!(json, json!({
-        "type": "ephemeral"
-    }));
-    
+
+    println!(
+        "Ephemeral cache_control JSON: {}",
+        serde_json::to_string(&json).unwrap()
+    );
+
+    assert_eq!(
+        json,
+        json!({
+            "type": "ephemeral"
+        })
+    );
+
     // Verify no ttl field is present
     assert!(!json.as_object().unwrap().contains_key("ttl"));
 }
@@ -25,26 +31,38 @@ fn test_ephemeral_cache_control_serialization() {
 fn test_five_minute_cache_control_serialization() {
     let cache_control = CacheControl::five_minute();
     let json = serde_json::to_value(&cache_control).unwrap();
-    
-    println!("5-minute cache_control JSON: {}", serde_json::to_string(&json).unwrap());
-    
-    assert_eq!(json, json!({
-        "type": "ephemeral",
-        "ttl": "5m"
-    }));
+
+    println!(
+        "5-minute cache_control JSON: {}",
+        serde_json::to_string(&json).unwrap()
+    );
+
+    assert_eq!(
+        json,
+        json!({
+            "type": "ephemeral",
+            "ttl": "5m"
+        })
+    );
 }
 
 #[test]
 fn test_one_hour_cache_control_serialization() {
     let cache_control = CacheControl::one_hour();
     let json = serde_json::to_value(&cache_control).unwrap();
-    
-    println!("1-hour cache_control JSON: {}", serde_json::to_string(&json).unwrap());
-    
-    assert_eq!(json, json!({
-        "type": "ephemeral",
-        "ttl": "1h"
-    }));
+
+    println!(
+        "1-hour cache_control JSON: {}",
+        serde_json::to_string(&json).unwrap()
+    );
+
+    assert_eq!(
+        json,
+        json!({
+            "type": "ephemeral",
+            "ttl": "1h"
+        })
+    );
 }
 
 #[test]
@@ -54,11 +72,16 @@ fn test_message_with_ephemeral_cache_control() {
         "System prompt".to_string(),
         CacheControl::ephemeral(),
     );
-    
+
     let json = serde_json::to_value(&msg).unwrap();
-    println!("Message with ephemeral cache_control: {}", serde_json::to_string(&json).unwrap());
-    
-    let cache_control = json.get("cache_control").expect("cache_control field should exist");
+    println!(
+        "Message with ephemeral cache_control: {}",
+        serde_json::to_string(&json).unwrap()
+    );
+
+    let cache_control = json
+        .get("cache_control")
+        .expect("cache_control field should exist");
     assert_eq!(cache_control.get("type").unwrap(), "ephemeral");
     assert!(!cache_control.as_object().unwrap().contains_key("ttl"));
 }
@@ -70,11 +93,16 @@ fn test_message_with_five_minute_cache_control() {
         "System prompt".to_string(),
         CacheControl::five_minute(),
     );
-    
+
     let json = serde_json::to_value(&msg).unwrap();
-    println!("Message with 5-minute cache_control: {}", serde_json::to_string(&json).unwrap());
-    
-    let cache_control = json.get("cache_control").expect("cache_control field should exist");
+    println!(
+        "Message with 5-minute cache_control: {}",
+        serde_json::to_string(&json).unwrap()
+    );
+
+    let cache_control = json
+        .get("cache_control")
+        .expect("cache_control field should exist");
     assert_eq!(cache_control.get("type").unwrap(), "ephemeral");
     assert_eq!(cache_control.get("ttl").unwrap(), "5m");
 }
@@ -86,11 +114,16 @@ fn test_message_with_one_hour_cache_control() {
         "System prompt".to_string(),
         CacheControl::one_hour(),
     );
-    
+
     let json = serde_json::to_value(&msg).unwrap();
-    println!("Message with 1-hour cache_control: {}", serde_json::to_string(&json).unwrap());
-    
-    let cache_control = json.get("cache_control").expect("cache_control field should exist");
+    println!(
+        "Message with 1-hour cache_control: {}",
+        serde_json::to_string(&json).unwrap()
+    );
+
+    let cache_control = json
+        .get("cache_control")
+        .expect("cache_control field should exist");
     assert_eq!(cache_control.get("type").unwrap(), "ephemeral");
     assert_eq!(cache_control.get("ttl").unwrap(), "1h");
 }
@@ -98,10 +131,13 @@ fn test_message_with_one_hour_cache_control() {
 #[test]
 fn test_message_without_cache_control() {
     let msg = Message::new(MessageRole::User, "Hello".to_string());
-    
+
     let json = serde_json::to_value(&msg).unwrap();
-    println!("Message without cache_control: {}", serde_json::to_string(&json).unwrap());
-    
+    println!(
+        "Message without cache_control: {}",
+        serde_json::to_string(&json).unwrap()
+    );
+
     // cache_control field should not be present when not set
     assert!(!json.as_object().unwrap().contains_key("cache_control"));
 }
@@ -110,9 +146,9 @@ fn test_message_without_cache_control() {
 fn test_cache_control_json_format_ephemeral() {
     let cache_control = CacheControl::ephemeral();
     let json_str = serde_json::to_string(&cache_control).unwrap();
-    
+
     println!("Ephemeral JSON string: {}", json_str);
-    
+
     // Verify exact JSON format
     assert_eq!(json_str, r#"{"type":"ephemeral"}"#);
 }
@@ -121,9 +157,9 @@ fn test_cache_control_json_format_ephemeral() {
 fn test_cache_control_json_format_five_minute() {
     let cache_control = CacheControl::five_minute();
     let json_str = serde_json::to_string(&cache_control).unwrap();
-    
+
     println!("5-minute JSON string: {}", json_str);
-    
+
     // Verify exact JSON format
     assert_eq!(json_str, r#"{"type":"ephemeral","ttl":"5m"}"#);
 }
@@ -132,9 +168,9 @@ fn test_cache_control_json_format_five_minute() {
 fn test_cache_control_json_format_one_hour() {
     let cache_control = CacheControl::one_hour();
     let json_str = serde_json::to_string(&cache_control).unwrap();
-    
+
     println!("1-hour JSON string: {}", json_str);
-    
+
     // Verify exact JSON format
     assert_eq!(json_str, r#"{"type":"ephemeral","ttl":"1h"}"#);
 }
@@ -143,7 +179,7 @@ fn test_cache_control_json_format_one_hour() {
 fn test_deserialization_ephemeral() {
     let json_str = r#"{"type":"ephemeral"}"#;
     let cache_control: CacheControl = serde_json::from_str(json_str).unwrap();
-    
+
     assert_eq!(cache_control.ttl, None);
 }
 
@@ -151,7 +187,7 @@ fn test_deserialization_ephemeral() {
 fn test_deserialization_five_minute() {
     let json_str = r#"{"type":"ephemeral","ttl":"5m"}"#;
     let cache_control: CacheControl = serde_json::from_str(json_str).unwrap();
-    
+
     assert_eq!(cache_control.ttl, Some("5m".to_string()));
 }
 
@@ -159,6 +195,6 @@ fn test_deserialization_five_minute() {
 fn test_deserialization_one_hour() {
     let json_str = r#"{"type":"ephemeral","ttl":"1h"}"#;
     let cache_control: CacheControl = serde_json::from_str(json_str).unwrap();
-    
+
     assert_eq!(cache_control.ttl, Some("1h".to_string()));
 }