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-cardano/changelog.d/20250919_095938_thomas.bagrel_object_diffusion.md

@@ -0,0 +1,23 @@
+<!--
+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
+
+- Added support for `NodeToNodeV_16`

ouroboros-consensus-diffusion/changelog.d/20250919_095930_thomas.bagrel_object_diffusion.md

@@ -0,0 +1,27 @@
+<!--
+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
+
+- Modify `Ouroboros.Consensus{.Node,.Node.Tracer,.Network.NodeToNode}` to wire-in PerasCertDiffusion similarly to other mini-protocols (e.g. TX-submission)
+
+### Non-Breaking
+
+- Update `Test.ThreadNet.Network` in `unstable-diffusion-testlib` accordingly to the changes made in `Ouroboros.Consensus.Network.NodeToNode`

ouroboros-consensus/changelog.d/20250918_104810_thomas.bagrel_object_diffusion.md

@@ -0,0 +1,28 @@
+<!--
+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.
+
+-->
+<!--
+
+
+- A bullet item for the Non-Breaking category.
+
+-->
+
+### Breaking
+
+- Relies on a new version of `ouroboros-network` with support for ObjectDiffusion mini-protocol
+- Added modules `Ouroboros.Consensus.MiniProtocol.ObjectDiffusion{.Inbound,.Outbound}` with implementations of the ObjectDiffusion protocol (quite similar/inspired from TX-submission, except that client = inbound, server = outbound)
+- Added module `Ouroboros.Consensus.MiniProtocol.ObjectDiffusion.ObjectPool.API` defining `ObjectPool{Reader,Writer}` interfaces, through which ObjectDiffusion accesses/stores the objects to send/that have been received.
+- Added modules `Ouroboros.Consensus.MiniProtocol.ObjectDiffusion.PerasCert` and `Ouroboros.Consensus.MiniProtocol.ObjectDiffusion.ObjectPool.PerasCert` containing definitions specific to `PerasCert` diffusion through the ObjectDiffusion mini-protocol 
+- Modifies `Ouroboros.Consensus.Node.Serialisation` to add CBOR serialisation (`SerialiseNodeToNode`) for `Point blk`, `Tip blk`, and  `PerasCert blk`
+- Added modules `Test.Consensus.MiniProtocol.ObjectDiffusion.Smoke` and `Test.Consensus.MiniProtocol.ObjectDiffusion.PerasCert.Smoke` with smoke tests for the general ObjectDiffusion mini-protocol and for the `PerasCert`-specific instance of it