Add create_comment tool to Basecamp integration

Updated mcp_server_cli.py to include the new tool in the CLI and modified README.md to document the new functionality. Adjusted test_cli_server.py to include the create_comment tool in the expected tools list.

basecamp_fastmcp.py

@@ -526,6 +526,38 @@ async def get_comments(recording_id: str, project_id: str) -> Dict[str, Any]:
             "message": str(e)
         }
 
+@mcp.tool()
+async def create_comment(recording_id: str, project_id: str, content: str) -> Dict[str, Any]:
+    """Create a comment on a Basecamp item.
+
+    Args:
+        recording_id: The item ID
+        project_id: The project ID
+        content: The comment content in HTML format
+    """
+    client = _get_basecamp_client()
+    if not client:
+        return _get_auth_error_response()
+
+    try:
+        comment = await _run_sync(client.create_comment, recording_id, project_id, content)
+        return {
+            "status": "success",
+            "comment": comment,
+            "message": "Comment created successfully"
+        }
+    except Exception as e:
+        logger.error(f"Error creating comment: {e}")
+        if "401" in str(e) and "expired" in str(e).lower():
+            return {
+                "error": "OAuth token expired",
+                "message": "Your Basecamp OAuth token expired during the API call. Please re-authenticate by visiting http://localhost:8000 and completing the OAuth flow again.",
+            }
+        return {
+            "error": "Execution error",
+            "message": str(e)
+        }
+
 @mcp.tool()
 async def get_campfire_lines(project_id: str, campfire_id: str) -> Dict[str, Any]:
     """Get recent messages from a Basecamp campfire (chat room).