Add changelog

Co-authored-by: Nicolas BACQUEY <nicolas.bacquey@tweag.io>
Co-authored-by: Thomas BAGREL <thomas.bagrel@tweag.io>
Co-authored-by: Agustin Mista <agustin.mista@moduscreate.com>

Author: 3 people

changelog.d/20260413_100031_agustin.mista_wfals_everyonevotes_implementations.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.
+-->
+
+<!--
+### Breaking
+
+- A bullet item for the Breaking category.
+
+-->
+### Non-Breaking
+
+- Implemented pure weighted Fait-Accompli logic.
+- Implemented local sortition check for non-persistent seats.
+- Implemented wFA^LS voting committee instance.
+- Implemented EveryoneVotes voting committee instance.
+
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->