docs: update CHANGELOG with initial development history

CHANGELOG.md

@@ -1,11 +1,23 @@
+# Changelog
 
+All notable changes to MokoSuiteAuto will be documented in this file.
 
-## [01.00.00] --- 2026-06-03
-
-### Changed
-- Migrated all workflow and template paths from `.github/` to `.mokogitea/`
-- Template source paths updated: `templates/gitea/` to `templates/mokogitea/`
-- HCL definition files removed -- Template repos are now the canonical source
+## [01.00.04-dev] - 2026-06-21
 
 ### Added
-- `branch-cleanup.yml`: auto-delete merged feature branches after PR merge
+- Package manifest (`pkg_mokosuiteauto.xml`) with dlid and updateservers
+- VehicleHelper: inventory filters, VIN lookup, dashboard stats, aging report
+- DealHelper: deal creation, gross profit (front+back with trade allowance), sales dashboard
+- TradeInHelper: appraisal submission, equity calculation, pending review queue
+- TestDriveHelper: scheduling, mileage check-out/in, daily schedule, vehicle history
+- FinancingHelper: loan calculator, term comparison, deal desking with negative equity
+- ServiceDeptHelper: repair orders, VIN history, open orders, service dashboard
+- Wiki: Home, guides/Installation, guides/Configuration, reference/Helpers
+- README with layer architecture and feature overview
+
+### Fixed
+- DealHelper: trade allowance was missing from front gross profit calculation
+- FinancingHelper: negative trade equity now rolls into financed amount (was silently dropped)
+
+### Security
+- Review #19: 2 critical fixes applied