Add a small helper that resolves a Tribes revision, exports a clean source tree from the local checkout, and asks pguix to compute the exact Guix fixed-output hashes for the source, raw Mix deps, prepared Mix deps, and npm deps.\n\nThe script updates tribes/packages/source.scm in one step, so bumping the pin no longer requires hand-running git archive, guix hash, and the mix/npm dependency hash pipeline separately.
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