Add entities/dreps/v0 namespace

[joaosreis]

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[Copilot]

Pull request overview

This PR adds support for the new Cardano ledger state namespace entities/dreps/v0 to the scls-cardano package by introducing its CDDL definition and wiring it into the known-namespace registry, conformance tests, and reference CDDL loading list.

Changes:

• Add a new CDDL namespace module Cardano.SCLS.Namespace.EntitiesDReps defining the record_entry schema.
• Register entities/dreps/v0 in Cardano.SCLS.CDDL (KnownSpec instance, knownNamespaces list, and NamespaceKeySize).
• Extend conformance and reference test infrastructure to include entities/dreps/v0.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
scls-cardano/testlib/Cardano/SCLS/Testlib.hs	Adds entities/dreps/v0 to the set of namespaces exercised by the testlib conformance properties.
scls-cardano/test/Reference.hs	Adds entities/dreps/v0 to the list of reference CDDL files expected from the CIP-0165 reference set.
scls-cardano/scls-cardano.cabal	Includes the new namespace module in the library build.
scls-cardano/cddl-src/Cardano/SCLS/Namespace/EntitiesDReps.hs	Introduces the CDDL rules for the entities/dreps/v0 namespace record_entry.
scls-cardano/cddl-src/Cardano/SCLS/CDDL.hs	Registers the new namespace spec, symbol, and key size in the central CDDL registry.

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