fix(billing): track actual tokens in ReAct mode instead of hardcoded 0/0

- process_react now returns (String, i64, i64) tuple with token counts
- Extract token stats from rig Agent FinalResponse usage field
- Both streaming and non-streaming ReAct modes now bill correctly

libs/agent/chat/service.rs

@@ -1065,7 +1065,7 @@ impl ChatService {
             .await
     }
 
-    pub async fn process_react<C>(&self, request: &AiRequest, mut on_chunk: C) -> Result<String>
+    pub async fn process_react<C>(&self, request: &AiRequest, mut on_chunk: C) -> Result<(String, i64, i64)>
     where
         C: FnMut(crate::react::ReactStep) + Send,
     {
@@ -1232,7 +1232,7 @@ impl ChatService {
         )
         .await;
 
-        Ok(final_content)
+        Ok((final_content, total_input_tokens, total_output_tokens))
     }
 }
 

libs/room/src/service/ai_react_nonstreaming.rs

@@ -33,7 +33,7 @@ pub async fn process_message_ai_react_nonstreaming(
             .await;
 
         match final_answer {
-            Ok(response) => {
+            Ok((response, input_tokens, output_tokens)) => {
                 if let Err(e) = create_and_publish_ai_message(
                     &db,
                     &cache,

libs/room/src/service/ai_react_streaming.rs

@@ -155,7 +155,14 @@ pub async fn process_message_ai_react_streaming(
             })
             .await;
 
-        let final_content = lock_or_recover(&answer_buffer).clone();
+        let (final_content, input_tokens, output_tokens, err_msg, should_log) = match result {
+            Ok((content, input, output)) => (content, input, output, None, false),
+            Err(e) => {
+                let msg = format!("[Agent error: {}]", e);
+                tracing::error!(error = %e, "ReAct streaming failed");
+                (String::new(), 0, 0, Some(msg), true)
+            }
+        };
         let all_steps = lock_or_recover(&steps).clone();
         let reasoning_chain: String = all_steps
             .iter()
@@ -175,12 +182,6 @@ pub async fn process_message_ai_react_streaming(
         } else {
             String::from("[No output from reasoning agent]")
         };
-
-        let (err_msg, should_log) = match &result {
-            Err(e) => (Some(format!("[Agent error: {}]", e)), true),
-            _ => (None, false),
-        };
-
         let content_to_persist = if let Some(msg) = &err_msg {
             format!(
                 "{}\n[Error during reasoning: {}]",
@@ -192,10 +193,6 @@ pub async fn process_message_ai_react_streaming(
             content_to_persist
         };
 
-        if should_log {
-            tracing::error!(error = %result.as_ref().unwrap_err(), "ReAct streaming failed");
-        }
-
         let persist_content = content_to_persist.trim().to_string();
         if persist_content.is_empty() {
             return;
@@ -254,13 +251,12 @@ pub async fn process_message_ai_react_streaming(
             }
 
             // Record billing (non-fatal)
-            // TODO: ReAct agent does not track token counts yet; billing with 0/0
             if let Err(e) = super::billing::record_ai_usage(
                 &db,
                 project_id_inner,
                 model_id,
-                0,
-                0,
+                input_tokens,
+                output_tokens,
             )
             .await
             {