changelog edits for 26.1.0 (#9732)

* add ADD opcode improvement to changelog

Signed-off-by: Sally MacFarlane <macfarla.github@gmail.com>

* move newer PRs to unreleased; add assertj

Signed-off-by: Sally MacFarlane <macfarla.github@gmail.com>

---------

Signed-off-by: Sally MacFarlane <macfarla.github@gmail.com>

Author: macfarla

CHANGELOG.md

@@ -3,6 +3,24 @@
 ## Unreleased
 
 ### Breaking Changes
+- **Chain pruning CLI options have been redesigned with new behavior:** [#9637](https://github.com/hyperledger/besu/pull/9637)
+  - `--Xchain-pruning-enabled` now accepts three strategy values instead of boolean:
+    - `ALL` - prunes both blocks and BALs (replaces the old `--Xchain-pruning-enabled=true`)
+    - `BAL` - prunes only BALs, keeps all blocks forever (new mode, **now the default**)
+    - `NONE` - disables all pruning (replaces the old `--Xchain-pruning-enabled=false`)
+  - `--Xchain-pruning-blocks-retained` behavior changes:
+    - In `ALL` mode: controls block retention (previously the only mode)
+    - In `BAL` mode: has no effect as blocks are never pruned
+    - Default value changed from `7200` to `113056` blocks (Weak Subjectivity Period: 3533 epochs × 32 slots)
+  - New flag `--Xchain-pruning-bals-retained` sets the number of BALs to retain:
+    - Defaults to the value of `--Xchain-pruning-blocks-retained` when not specified
+    - Must be >= `113056` (configurable via `--Xchain-pruning-retained-minimum`)
+    - In `ALL` mode: should typically be less than or equal to `--Xchain-pruning-blocks-retained`
+    - In `BAL` mode: controls BAL retention independently
+  - `--Xchain-pruning-frequency` now controls both block and BAL pruning operations (previously only controlled block pruning)
+  - Renamed `--Xchain-pruning-blocks-retained-limit` to `--Xchain-pruning-retained-minimum` (applies to both blocks and BALs)
+    - New default value: `113056` blocks (3533 epochs × 32 slots, based on Weak Subjectivity Period)
+    - Previous default: `7200` blocks
 
 ### Upcoming Breaking Changes
 - RPC changes to enhance compatibility with other ELs
@@ -18,6 +36,8 @@
 
 ### Additions and Improvements
 - Add ability to pass a custom tracer to block simulation [#9708](https://github.com/hyperledger/besu/pull/9708)
+- Add support for `4byteTracer` in `debug_trace*` methods to collect function selectors from internal calls via PR [#9642](https://github.com/hyperledger/besu/pull/9642). Thanks to [@JukLee0ira](https://github.com/JukLee0ira).
+- Update assertj to v3.27.7 [#9710](https://github.com/hyperledger/besu/pull/9710)
 
 ### Bug fixes
 
@@ -28,24 +48,6 @@
 - RPC changes to enhance compatibility with other ELs
   - RPCs using filter parameter including `eth_getLogs` and `trace_filter` return an error if `fromBlock` is greater than `toBlock`, or if `toBlock` extends beyond chain head (previously returned an empty list) [#9604](https://github.com/hyperledger/besu/pull/9604)
 - Plugin API changes to BlockHeader, Log, LogWithMetadata, TransactionProcessingResult and TransactionReceipt to use specific types for LogsBloomFilter, LogTopic and Log [#9556](https://github.com/hyperledger/besu/pull/9556)
-- **Chain pruning CLI options have been redesigned with new behavior:** [#9637](https://github.com/hyperledger/besu/pull/9637)
-  - `--Xchain-pruning-enabled` now accepts three strategy values instead of boolean:
-    - `ALL` - prunes both blocks and BALs (replaces the old `--Xchain-pruning-enabled=true`)
-    - `BAL` - prunes only BALs, keeps all blocks forever (new mode, **now the default**)
-    - `NONE` - disables all pruning (replaces the old `--Xchain-pruning-enabled=false`)
-  - `--Xchain-pruning-blocks-retained` behavior changes:
-    - In `ALL` mode: controls block retention (previously the only mode)
-    - In `BAL` mode: has no effect as blocks are never pruned
-    - Default value changed from `7200` to `113056` blocks (Weak Subjectivity Period: 3533 epochs × 32 slots)
-  - New flag `--Xchain-pruning-bals-retained` sets the number of BALs to retain:
-    - Defaults to the value of `--Xchain-pruning-blocks-retained` when not specified
-    - Must be >= `113056` (configurable via `--Xchain-pruning-retained-minimum`)
-    - In `ALL` mode: should typically be less than or equal to `--Xchain-pruning-blocks-retained`
-    - In `BAL` mode: controls BAL retention independently
-  - `--Xchain-pruning-frequency` now controls both block and BAL pruning operations (previously only controlled block pruning)
-  - Renamed `--Xchain-pruning-blocks-retained-limit` to `--Xchain-pruning-retained-minimum` (applies to both blocks and BALs)
-    - New default value: `113056` blocks (3533 epochs × 32 slots, based on Weak Subjectivity Period)
-    - Previous default: `7200` blocks
 
 ### Upcoming Breaking Changes
 - RPC changes to enhance compatibility with other ELs
@@ -59,10 +61,9 @@
     - Clique Block Production (mining) - you will still be able to sync existing Clique networks, but not be a validator or create new Clique networks.
     - Fast Sync
 - `--history-expiry-prune` is deprecated and will be removed in a future release
-
 
 ### Additions and Improvements
-- Add support for `4byteTracer` in `debug_trace*` methods to collect function selectors from internal calls via PR [#9462][9462]. Thanks to [@JukLee0ira](https://github.com/JukLee0ira).
+- Performance: Optimise ADD Opcode: ADD 86% faster, using new UInt256 implementation [#9477](https://github.com/hyperledger/besu/pull/9477)
 - Performance: Optimise EIP-196 AltBn128: EcAdd 33-128% faster, EcMul 8% faster [#9570](https://github.com/hyperledger/besu/pull/9570)
 - Performance: Improved `getBlobsV2` by disabling HTTP response compression for engine API, with up to 10× throughput improvement observed for large numbers of blobs. [#9667](https://github.com/hyperledger/besu/pull/9667)
 - Performance: Replace BytesTrieSet with HashSet, improves CREATE, CREATE2, SELFDESTRUCT and jumpdest analysis by up to 48% [#9641](https://github.com/hyperledger/besu/pull/9641)