= Solution
The relation in part vi gives
$$
\Phi'{}^\dagger e^{2V'}\Phi'
=\Phi^\dagger e^{2i\Lambda^\dagger}
e^{-2i\Lambda^\dagger}e^{2V}e^{2i\Lambda}e^{-2i\Lambda}\Phi
=\Phi^\dagger e^{2V}\Phi,
$$
so the full-superspace term has <gauge invariance>. The <chiral field-strength superfield> transforms covariantly,
$$
W_\alpha' =e^{-2i\Lambda}W_\alpha e^{2i\Lambda}.
$$
Cyclicity of the <matrix trace> then gives $\operatorname{Tr}(W'{}^\alpha W'_\alpha)=\operatorname{Tr}(W^\alpha W_\alpha)$. Both superspace integrals, and hence the entire Lagrangian density, are invariant.
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