feat: add Qwen Code support to Spec Kit

Add comprehensive Qwen Code integration following existing patterns:

- Add Qwen as fourth AI assistant option in CLI
- Update all documentation to include Qwen CLI references
- Extend GitHub Actions workflow for Qwen template generation
- Add Qwen support to shell scripts and templates
- Maintain backward compatibility with existing assistants

src/specify_cli/__init__.py

@@ -51,7 +51,8 @@ import readchar
 AI_CHOICES = {
     "copilot": "GitHub Copilot",
     "claude": "Claude Code",
-    "gemini": "Gemini CLI"
+    "gemini": "Gemini CLI",
+    "qwen": "Qwen Code"
 }
 
 # ASCII Art Banner
@@ -638,7 +639,7 @@ def download_and_extract_template(project_path: Path, ai_assistant: str, is_curr
 @app.command()
 def init(
     project_name: str = typer.Argument(None, help="Name for your new project directory (optional if using --here)"),
-    ai_assistant: str = typer.Option(None, "--ai", help="AI assistant to use: claude, gemini, or copilot"),
+    ai_assistant: str = typer.Option(None, "--ai", help="AI assistant to use: claude, gemini, copilot, or qwen"),
     ignore_agent_tools: bool = typer.Option(False, "--ignore-agent-tools", help="Skip checks for AI agent tools like Claude Code"),
     no_git: bool = typer.Option(False, "--no-git", help="Skip git repository initialization"),
     here: bool = typer.Option(False, "--here", help="Initialize project in the current directory instead of creating a new one"),
@@ -648,7 +649,7 @@ def init(
     
     This command will:
     1. Check that required tools are installed (git is optional)
-    2. Let you choose your AI assistant (Claude Code, Gemini CLI, or GitHub Copilot)
+    2. Let you choose your AI assistant (Claude Code, Gemini CLI, GitHub Copilot, or Qwen Code)
     3. Download the appropriate template from GitHub
     4. Extract the template to a new project directory or current directory
     5. Initialize a fresh git repository (if not --no-git and no existing repo)
@@ -659,6 +660,7 @@ def init(
         specify init my-project --ai claude
         specify init my-project --ai gemini
         specify init my-project --ai copilot --no-git
+        specify init my-project --ai qwen
         specify init --ignore-agent-tools my-project
         specify init --here --ai claude
         specify init --here
@@ -737,6 +739,10 @@ def init(
             if not check_tool("gemini", "Install from: https://github.com/google-gemini/gemini-cli"):
                 console.print("[red]Error:[/red] Gemini CLI is required for Gemini projects")
                 agent_tool_missing = True
+        elif selected_ai == "qwen":
+            if not check_tool("qwen", "Install from: https://github.com/QwenLM/qwen-code"):
+                console.print("[red]Error:[/red] Qwen CLI is required for Qwen Code projects")
+                agent_tool_missing = True
         # GitHub Copilot check is not needed as it's typically available in supported IDEs
         
         if agent_tool_missing:
@@ -824,6 +830,12 @@ def init(
         steps_lines.append("   - See GEMINI.md for all available commands")
     elif selected_ai == "copilot":
         steps_lines.append(f"{step_num}. Open in Visual Studio Code and use [bold cyan]/specify[/], [bold cyan]/plan[/], [bold cyan]/tasks[/] commands with GitHub Copilot")
+    elif selected_ai == "qwen":
+        steps_lines.append(f"{step_num}. Use / commands with Qwen CLI")
+        steps_lines.append("   - Run qwen /specify to create specifications")
+        steps_lines.append("   - Run qwen /plan to create implementation plans")
+        steps_lines.append("   - Run qwen /tasks to generate tasks")
+        steps_lines.append("   - See QWEN.md for all available commands")
 
     step_num += 1
     steps_lines.append(f"{step_num}. Update [bold magenta]CONSTITUTION.md[/bold magenta] with your project's non-negotiable principles")
@@ -856,11 +868,12 @@ def check():
     console.print("\n[cyan]Optional AI tools:[/cyan]")
     claude_ok = check_tool("claude", "Install from: https://docs.anthropic.com/en/docs/claude-code/setup")
     gemini_ok = check_tool("gemini", "Install from: https://github.com/google-gemini/gemini-cli")
+    qwen_ok = check_tool("qwen", "Install from: https://github.com/QwenLM/qwen-code")
     
     console.print("\n[green]✓ Specify CLI is ready to use![/green]")
     if not git_ok:
         console.print("[yellow]Consider installing git for repository management[/yellow]")
-    if not (claude_ok or gemini_ok):
+    if not (claude_ok or gemini_ok or qwen_ok):
         console.print("[yellow]Consider installing an AI assistant for the best experience[/yellow]")