Add changelog

Author: agustinmista

changelog.d/20260825_140029_agustin.mista_add_peras_state_to_ext_ledger_state.md

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+### Breaking
+
+- Add `perasState` field of type `PerasState` to `ExtLedgerState` (serialisation remains backwards compatible).
+- `LedgerDbSerialiseConstraints` now require `Typeable` evidence for Peras types plus `ToCBOR`/`FromCBOR` for the Peras voting committee.
+- Ticking the `ExtLedgerState` now updates the Peras epoch-context resolver, requiring `StateSupportsPerasEpochContext` as a superclass constraint in several places (notably `IsLedger` and `ApplyBlock`).
+
+### Non-Breaking
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+- Add `mkPerasEpochContextResolverHandle` helper to construct a `PerasEpochContextResolverHandle` from the extended ledger state.
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