Lifespan wrapper is not found in the 1.2.1 release

[danthekishan]

Describe the bug

Adding lifespan configuration to the FastMCP server does not get initialized or called during startup.
And I checked the source code of the cached package and also files in pypi, and it seems like the lifespan_wrapper and setup is missing in the released version. (and I see them in github main branch)

When testing the example (running the query_db tool) below in dev mode, (mcp dev) getting an error, saying,
Error executing tool query_db: 'RequestContext' object has no attribute 'lifespan_context'

To Reproduce

Steps to reproduce the behavior:

1. Adding a lifespan to mcp app

@asynccontextmanager
async def app_lifespan(server: FastMCP) -> AsyncIterator[AppContext]:
    """Manage application lifecycle with type-safe context"""
    try:
        # Initialize on startup
        await db.connect()
        yield AppContext(db=db)
    finally:
        # Cleanup on shutdown
        await db.disconnect()

# Pass lifespan to server
mcp = FastMCP("My App", lifespan=app_lifespan)

2. Add tool to use the Appcontext

@mcp.tool()
def query_db(ctx: Context) -> str:
    """Tool that uses initialized resources"""
    data = ctx.request_context.lifespan_context["data"]
    return data

Expected behavior
Expected lifespan_context to be available or to be initialized during startup

Desktop (please complete the following information):

• OS: macOS m2 pro (15.2)
• Browser: chrome

[dsp-ant]

Lifespan is only supported in 1.3.0 and later only. To see the readme for 1.2.1 please look at the v1.2.x branch.