fix(auth): get_access_token reflects current request in stateful sessions#2675
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Fixes #2208.
Stateful Streamable HTTP sessions start the server task group on the first request. Anyio copies the request contextvars into that long-lived task, so get_access_token() could keep returning the token from the session-creating request even when later requests send a different Authorization header.
This change pushes the authenticated user into the auth contextvar at request-dispatch time (using the ServerMessageMetadata.request_context threaded through the transport), and resets it after the handler returns.
Tests: