Add the Consensus fortnightly update for 2025-12-10 (#709)

Author: dnadales

blog/2025-12-10-consensus.md

@@ -0,0 +1,21 @@
+---
+title: Consensus Team Update
+slug: 2025-12-10-consensus
+authors: dnadales
+tags: [consensus]
+hide_table_of_contents: false
+---
+
+## High level summary
+
+- Completed the LSM work in Consensus. Remaining LSM work is just integration in API, CLI, and Node which will be done as part of Node 10.7. In particular we:
+    - Made forkers more observable ([#1773](https://github.com/IntersectMBO/ouroboros-consensus/pull/1773)).
+    - Updated the code to reject legacy snapshots ([#1774](https://github.com/IntersectMBO/ouroboros-consensus/pull/1774)).
+    - Updated to latest LSM-trees ([#1776](https://github.com/IntersectMBO/ouroboros-consensus/pull/1776)), including dependency updates to allow older `filepath` ([#804](https://github.com/IntersectMBO/lsm-tree/pull/804)) and older `unix` ([#805](https://github.com/IntersectMBO/lsm-tree/pull/805)).
+- Fixed a deadlock in the `V1LMDB` mempool implementation ([#1787](https://github.com/IntersectMBO/ouroboros-consensus/issues/1787), [#1798](https://github.com/IntersectMBO/ouroboros-consensus/pull/1798)).
+- Resolved a memory leak in benchmarks for the 10.6.1 release ([#1802](https://github.com/IntersectMBO/ouroboros-consensus/pull/1802)).
+- Prepared a 10.6.1 node with LSM-trees for [preliminary deployment on a relay](https://github.com/IntersectMBO/cardano-node/tree/js/lsm-10.6.1) to gather performance measurements.
+- Successfully compiled an [untested prototype of a node](https://github.com/IntersectMBO/cardano-node/tree/js/multiple-tables) using different tables per block, preparatory work for LedgerHD planned for Node 10.8.
+- Modified `cardano-testnet` to support running with `kes-agent`.
+- Made progress on migrating Leios demos to `ouroboros-leios`, including traffic control support for network delay and bandwidth configuration in Leios experiments ([#651](https://github.com/input-output-hk/ouroboros-leios/pull/651)). The remaining work involves making sure CI passes and incorporating review feedback.
+- Continued work on Node 10.7 integration.