fix: Enable .NET runtime roll-forward for compatibility with newer versions (#276)

Add RollForward property to support running CLI on .NET 9, 10, and future versions without requiring exact .NET 8.0 installation.

Changes:
- Add <RollForward>Major</RollForward> to CLI csproj
- Update README.md with .NET 8.0+ system requirements
- Update CLAUDE.md to reflect cross-version compatibility
- Update .NET badge to show "8.0+" instead of "8.0"

Fixes issue where users with only newer .NET versions (e.g., 10.0.3) couldn't run the CLI without installing .NET 8.0 specifically.

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: sellakumaran

CLAUDE.md

@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-Microsoft Agent 365 DevTools CLI (`a365`) - A .NET 8.0 CLI tool for deploying and managing Microsoft Agent 365 applications on Azure. Supports .NET, Node.js, and Python applications with auto-detection.
+Microsoft Agent 365 DevTools CLI (`a365`) - A .NET CLI tool built on .NET 8.0 with support for running on .NET 8.0 or higher (e.g., .NET 9, 10). Used for deploying and managing Microsoft Agent 365 applications on Azure. Supports .NET, Node.js, and Python applications with auto-detection.
 
 ## Build Commands
 

README.md

@@ -4,7 +4,7 @@
 [![Downloads](https://img.shields.io/nuget/dt/Microsoft.Agents.A365.DevTools.Cli?label=Downloads&color=green)](https://www.nuget.org/packages/Microsoft.Agents.A365.DevTools.Cli)
 [![Build Status](https://img.shields.io/github/actions/workflow/status/microsoft/Agent365-devTools/.github/workflows/ci.yml?branch=main&label=Build&logo=github)](https://github.com/microsoft/Agent365-devTools/actions)
 [![License](https://img.shields.io/badge/License-MIT-blue)](LICENSE)
-[![.NET](https://img.shields.io/badge/.NET-8.0-512BD4)](https://dotnet.microsoft.com/)
+[![.NET](https://img.shields.io/badge/.NET-8.0+-512BD4)](https://dotnet.microsoft.com/)
 [![Contributors](https://img.shields.io/github/contributors/microsoft/Agent365-devTools?label=Contributors)](https://github.com/microsoft/Agent365-devTools/graphs/contributors)
 
 > **Note:**  
@@ -37,6 +37,11 @@ This project is currently in active development. The CLI is being actively devel
 
 ### Prerequisites
 
+**System Requirements:**
+- **.NET 8.0 or higher**: The CLI requires .NET 8.0 runtime or any newer version (e.g., .NET 9, 10). [Download .NET](https://dotnet.microsoft.com/download)
+
+**Entra ID App Registration:**
+
 Before using the Agent365 CLI, you must create a custom Entra ID app registration with specific Microsoft Graph API permissions:
 
 1. **Custom Client App Registration**: Create an app in your Entra ID tenant

src/Microsoft.Agents.A365.DevTools.Cli/Microsoft.Agents.A365.DevTools.Cli.csproj

@@ -5,6 +5,9 @@
     <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>Microsoft.Agents.A365.DevTools.Cli</RootNamespace>
 
+    <!-- Runtime Configuration: Allow running on newer .NET versions -->
+    <RollForward>Major</RollForward>
+
     <!-- Package as .NET Tool -->
     <IsPackable>true</IsPackable>
     <PackAsTool>true</PackAsTool>