Follow-up to #2563 which fixed the signature handling in create_function_without_params. PR #2563 added unit tests for the utility function itself, but lacked integration tests for the actual user-facing scenario from #2524.

These tests ensure decorated functions with functools.wraps and Context parameters work correctly across all object types:

• Tools: Both ToolManager-level and idiomatic @mcp.tool + Client
• Prompts: Prompt.from_function with decorated functions
• Resource Templates: ResourceTemplate.from_function with decorated functions

def custom_decorator(func):
    @functools.wraps(func)
    async def wrapper(*args, **kwargs):
        return await func(*args, **kwargs)
    return wrapper

@mcp.tool
@custom_decorator
async def my_tool(ctx: Context, query: str) -> str:
    return f"query: {query}"

Closes #2524