Document repository polish in changelog

Author: meganfoster-dotcom

CHANGELOG.md

@@ -4,6 +4,16 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased
 
+## Repository Polish - 2026-06-08
+
+### Added
+- Added real repository visual snapshot assets generated from the current file tree.
+- Added public maintenance documentation updates: security policy, issue/PR templates, and repository snapshot notes.
+
+### Validation
+- Re-ran the documented test suite during the polish pass and recorded the real test status in docs/project-snapshot.md.
+
+
 - Added repository polish: security policy, contribution workflow, CI baseline, and clearer documentation structure.
 
 ## Initial Public Version