Add token usage and context % to timing footer

Added a quality-of-life feature that displays:
- Tokens used in the current turn (from LLM response, not estimated)
- Current context window usage percentage

These are displayed dimmed after the timing info:
  ⏱️ 1.2s | 💭 0.3s  1234tk | 45% ctx

The token count comes directly from the LLM's usage response data,
not from any estimation. If no usage data is available from the LLM,
only the context percentage is shown.

crates/g3-core/src/lib.rs

@@ -205,6 +205,7 @@ impl g3_computer_control::WebDriverController for WebDriverSession {
             WebDriverSession::Chrome(driver) => driver.quit().await,
         }
     }
+
 }
 
 // Additional methods for WebDriverSession that aren't part of the WebDriverController trait
@@ -3925,6 +3926,7 @@ impl<W: UiWriter> Agent<W> {
         const MAX_AUTO_SUMMARY_ATTEMPTS: usize = 5; // Limit auto-summary retries (increased from 2 for better recovery)
         let mut final_output_called = false; // Track if final_output was called
         // Note: Session-level duplicate tracking was removed - we only prevent sequential duplicates (DUP IN CHUNK, DUP IN MSG)
+        let mut turn_accumulated_usage: Option<g3_providers::Usage> = None; // Track token usage for timing footer
 
         // Check if we need to summarize before starting
         if self.context_window.should_summarize() {
@@ -4170,6 +4172,7 @@ impl<W: UiWriter> Agent<W> {
                         // Capture usage data if available
                         if let Some(ref usage) = chunk.usage {
                             accumulated_usage = Some(usage.clone());
+                            turn_accumulated_usage = Some(usage.clone());
                             debug!(
                                 "Received usage data - prompt: {}, completion: {}, total: {}",
                                 usage.prompt_tokens, usage.completion_tokens, usage.total_tokens
@@ -4866,11 +4869,17 @@ impl<W: UiWriter> Agent<W> {
 
                                 // Add timing if needed
                                 let final_response = if show_timing {
+                                    let turn_tokens = turn_accumulated_usage.as_ref().map(|u| u.total_tokens);
+                                    let timing_footer = Self::format_timing_footer(
+                                        stream_start.elapsed(),
+                                        _ttft,
+                                        turn_tokens,
+                                        self.context_window.percentage_used(),
+                                    );
                                     format!(
-                                        "{}\n\n⏱️ {} | 💭 {}",
+                                        "{}\n\n{}",
                                         full_response,
-                                        Self::format_duration(stream_start.elapsed()),
-                                        Self::format_duration(_ttft)
+                                        timing_footer
                                     )
                                 } else {
                                     full_response
@@ -5119,11 +5128,17 @@ impl<W: UiWriter> Agent<W> {
                 
                 // Add timing if needed
                 let final_response = if show_timing {
+                    let turn_tokens = turn_accumulated_usage.as_ref().map(|u| u.total_tokens);
+                    let timing_footer = Self::format_timing_footer(
+                        stream_start.elapsed(),
+                        _ttft,
+                        turn_tokens,
+                        self.context_window.percentage_used(),
+                    );
                     format!(
-                        "{}\n\n⏱️ {} | 💭 {}",
+                        "{}\n\n{}",
                         full_response,
-                        Self::format_duration(stream_start.elapsed()),
-                        Self::format_duration(_ttft)
+                        timing_footer
                     )
                 } else {
                     full_response
@@ -5140,11 +5155,17 @@ impl<W: UiWriter> Agent<W> {
 
         // Add timing if needed
         let final_response = if show_timing {
+            let turn_tokens = turn_accumulated_usage.as_ref().map(|u| u.total_tokens);
+            let timing_footer = Self::format_timing_footer(
+                stream_start.elapsed(),
+                _ttft,
+                turn_tokens,
+                self.context_window.percentage_used(),
+            );
             format!(
-                "{}\n\n⏱️ {} | 💭 {}",
+                "{}\n\n{}",
                 full_response,
-                Self::format_duration(stream_start.elapsed()),
-                Self::format_duration(_ttft)
+                timing_footer
             )
         } else {
             full_response
@@ -6977,6 +6998,23 @@ impl<W: UiWriter> Agent<W> {
             format!("{}m {:.1}s", minutes, remaining_seconds)
         }
     }
+
+    /// Format the timing footer with optional token usage info
+    fn format_timing_footer(
+        elapsed: Duration,
+        ttft: Duration,
+        turn_tokens: Option<u32>,
+        context_percentage: f32,
+    ) -> String {
+        let timing = format!("⏱️ {} | 💭 {}", Self::format_duration(elapsed), Self::format_duration(ttft));
+        
+        // Add token usage info if available (dimmed)
+        if let Some(tokens) = turn_tokens {
+            format!("{}  \x1b[2m{}tk | {:.0}% ctx\x1b[0m", timing, tokens, context_percentage)
+        } else {
+            format!("{}  \x1b[2m{:.0}% ctx\x1b[0m", timing, context_percentage)
+        }
+    }
 }
 
 // Note: JSON tool call filtering is now handled by UiWriter::filter_json_tool_calls (implemented in g3-cli)