Add changelogs

Author: jasagredo

ouroboros-consensus-diffusion/changelog.d/20251023_154349_javier.sagredo_expose_for_node.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
+
+- `srnLedgerDbBackendArgs` now receives and returns a `StdGen` argument.

ouroboros-consensus/changelog.d/20251023_154344_javier.sagredo_expose_for_node.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
+
+- LSM-trees database directory is now created on startup.
+
+### Non-Breaking
+
+- Expose `Ouroboros.Consensus.Storage.LedgerDB.(V1.BackingStore|V2).Backend(Trace)` constructors.
+
+### Breaking
+
+- `Ouroboros.Consensus.Storage.LedgerDB.(V1.BackingStore|V2).Backend(Trace)` no longer depends on the running monad `m`.