Update CHANGELOG.md

Author: root28root

CHANGELOG.md

@@ -1,3 +1,7 @@
-## [v0.1.0] – 2025-09-17
-- Initial snapshot: all projects compile, unit tests added
-- CI: repo-wide check + sanity checks
+# Changelog
+
+## v0.1.0 — First public snapshot
+- ✅ All 4 packages compile on Aptos CLI 7.8.0
+- ✅ CI (GitHub Actions) + repo-wide tests `./tools/check.sh`
+- ✅ 8 unit tests across packages (2 per project)
+- ✅ Devnet publish + demo entry points documented