Add changelog entry

Co-authored-by: Agustin Mista <[email protected]>
Co-authored-by: Alexander Esgen <[email protected]>
Co-authored-by: Georgy Lukyanov <[email protected]>
Co-authored-by: Thomas BAGREL <[email protected]>
Co-authored-by: Nicolas BACQUEY <[email protected]>
Co-authored-by: Nicolas "Niols" Jeannerod <[email protected]>

Author: 6 people

ouroboros-consensus-diffusion/changelog.d/20250919_095435_thomas.bagrel_weighted_chain_selec.md

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+A new scriv changelog fragment.
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+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
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+<!--
+### Patch
+
+- A bullet item for the Patch category.
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+-->
+<!--
+### Non-Breaking
+
+- A bullet item for the Non-Breaking category.
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+-->
+
+### Breaking
+
+- In module `Ouroboros.Consensus.Node.GSM`, `GSMView` now has a monadic `getCandidateOverSelection :: STM m ( selection -> chainSyncState -> CandidateVersusSelection)` instead of the previous pure `candidateOverSelection`.

ouroboros-consensus/changelog.d/20250917_144846_nicolas.bacquey_weighted_chain_selec.md

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+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
+-->
+
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+<!--
+### Non-Breaking
+
+- A bullet item for the Non-Breaking category.
+
+-->
+### Breaking
+
+- Make the `ChainDB` aware of `CertDB`, and modify the chain selection function accordingly. In practice, it means that the candidate fragment is now selected based on its Peras weight, instead of its length.
+- Add module `Ouroboros.Consensus.Peras.SelectView`, which introduces views to correctly measure the length of a chain fragment when accounting for EBBs.