Address code review feedback: improve imports and add TODO comments

Co-authored-by: Harmanpreet-Microsoft <175086414+Harmanpreet-Microsoft@users.noreply.github.com>

Author: Copilot

src/backend/v4/api/router.py

@@ -2,6 +2,7 @@
 import json
 import logging
 import os
+import tempfile
 import uuid
 from typing import Optional
 from datetime import datetime
@@ -35,6 +36,7 @@
     WebSocket,
     WebSocketDisconnect,
 )
+from fastapi.responses import FileResponse
 from v4.common.services.plan_service import PlanService
 from v4.common.services.team_service import TeamService
 from v4.config.settings import (
@@ -1469,7 +1471,6 @@ async def generate_branch_report(
       500:
         description: Internal server error
     """
-    from fastapi.responses import FileResponse
 
     # Validate user authentication
     authenticated_user = get_authenticated_user_details(request_headers=request.headers)
@@ -1480,8 +1481,8 @@ async def generate_branch_report(
         )
 
     try:
-        # Create output directory if it doesn't exist
-        output_dir = "/tmp/reports"
+        # Create output directory if it doesn't exist (platform-independent)
+        output_dir = os.path.join(tempfile.gettempdir(), "reports")
         os.makedirs(output_dir, exist_ok=True)
 
         # Generate filename with timestamp

src/backend/v4/common/services/branch_report_service.py

@@ -32,8 +32,9 @@ async def fetch_branches_from_github(github_tools, owner: str, repo: str) -> Lis
             List of branch dictionaries
         """
         try:
-            # This would use the actual github_tools in production
-            # For now, returning empty list as placeholder
+            # TODO: Integrate with actual GitHub MCP tools when available
+            # This is a placeholder that returns empty data
+            # In production, this would call github_tools.list_branches(owner, repo)
             logger.info(f"Fetching branches for {owner}/{repo}")
             return []
         except Exception as e:
@@ -54,8 +55,9 @@ async def fetch_pull_requests_from_github(github_tools, owner: str, repo: str) -
             List of pull request dictionaries
         """
         try:
-            # This would use the actual github_tools in production
-            # For now, returning empty list as placeholder
+            # TODO: Integrate with actual GitHub MCP tools when available
+            # This is a placeholder that returns empty data
+            # In production, this would call github_tools.list_pull_requests(owner, repo)
             logger.info(f"Fetching pull requests for {owner}/{repo}")
             return []
         except Exception as e: