docs(changelog): add unreleased entries for raft HA hardening PR #3230

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: auricom

CHANGELOG.md

@@ -9,6 +9,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add `election_timeout`, `snapshot_threshold`, and `trailing_logs` configuration fields to `RaftConfig` [#3230](https://github.com/evstack/ev-node/pull/3230)
+- Add `ResignLeader()` public method on raft `Node` and implement `LeaderResigner` interface on `FullNode` for graceful leadership transfer [#3230](https://github.com/evstack/ev-node/pull/3230)
+- Annotate FSM apply log and `RaftApplyMsg` with raft term for block provenance auditing [#3230](https://github.com/evstack/ev-node/pull/3230)
+
+### Fixed
+
+- Fix follower crash on restart when EVM state is ahead of a stale raft snapshot [#3230](https://github.com/evstack/ev-node/pull/3230)
+- Fix raft leader handoff regression after SIGTERM caused by data race on FSM apply callback (guard with `RWMutex`) [#3230](https://github.com/evstack/ev-node/pull/3230)
+- Resign raft leadership before cancelling context on SIGTERM to prevent spurious re-elections [#3230](https://github.com/evstack/ev-node/pull/3230)
+- Abdicate raft leadership when the store is significantly behind raft state to prevent stale-leader scenarios [#3230](https://github.com/evstack/ev-node/pull/3230)
+- Suppress noisy boltdb `Rollback failed: tx closed` log messages [#3230](https://github.com/evstack/ev-node/pull/3230)
+- Reject negative `ElectionTimeout` values in `RaftConfig.Validate` [#3230](https://github.com/evstack/ev-node/pull/3230)
+
 ### Changes
 
 - Make it easier to override `DefaultMaxBlobSize` by ldflags [#3235](https://github.com/evstack/ev-node/pull/3235)