Adds CST parser test coverage for the << and >> binary operators introduced in the previous commit.

Changes

• crates/mq-lang/src/cst/parser.rs: Two new #[rstest] cases covering:
  • left_shift: a << b → NodeKind::BinaryOp(BinaryOp::LeftShift)
  • right_shift: a >> b → NodeKind::BinaryOp(BinaryOp::RightShift)

Tests follow the existing binary op test pattern and run under the cst feature flag:

#[case::left_shift(
    vec![
        Shared::new(token(TokenKind::Ident("a".into()))),
        Shared::new(token(TokenKind::LeftShift)),
        Shared::new(token(TokenKind::Ident("b".into()))),
    ],
    (
        vec![Shared::new(Node {
            kind: NodeKind::BinaryOp(BinaryOp::LeftShift),
            token: Some(Shared::new(token(TokenKind::LeftShift))),
            ...
        })],
        ErrorReporter::default()
    )
)]

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