docs: Update CHANGELOG for v1.3.1

Author: wagnert

CHANGELOG.md

@@ -5,6 +5,21 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.1] - 2026-03-06
+
+### Changed
+
+- `cumulate-daily-worklogs` tool now filters entries by `notes === "Manual entry"` only
+- Booking proposals now correctly use only manually tracked entries, ignoring auto-tracked session entries
+
+### Removed
+
+- Obsolete `sync-worklogs` command (functionality replaced by `booking-proposal`)
+
+### Fixed
+
+- Replace real email addresses with `j.doe@example.com` in documentation examples
+
 ## [1.3.0] - 2026-03-05
 
 ### Added