feat: Update response handling and logging for improved usage tracking

open-sse/translator/response/kiro-to-openai.js

@@ -146,6 +146,8 @@ export function convertKiroToOpenAI(chunk, state) {
 
   // Handle completion/done events
   if (eventType === "messageStopEvent" || eventType === "done" || data.messageStopEvent) {
+    state.finishReason = "stop"; // Mark for usage injection in stream.js
+    
     const openaiChunk = {
       id: state.responseId,
       object: "chat.completion.chunk",

open-sse/translator/response/openai-responses.js

@@ -505,6 +505,8 @@ export function openaiResponsesToOpenAIResponse(chunk, state) {
     
     if (!state.finishReasonSent) {
       state.finishReasonSent = true;
+      state.finishReason = "stop"; // Mark for usage injection in stream.js
+      
       const finalChunk = {
         id: state.chatId,
         object: "chat.completion.chunk",

open-sse/translator/response/openai-to-claude.js

@@ -192,7 +192,10 @@ export function openaiToClaudeResponse(chunk, state) {
       });
     }
 
-    // Use tracked usage or default to 0
+    // Mark finish for later usage injection in stream.js
+    state.finishReason = choice.finish_reason;
+    
+    // Use tracked usage (will be estimated in stream.js if not valid)
     const finalUsage = state.usage || { input_tokens: 0, output_tokens: 0 };
     results.push({
       type: "message_delta",