chore(main): release 0.3.1

Author: github-actions[bot]

.release-please-manifest.json

@@ -1 +1 @@
-{".":"0.3.0"}
+{".":"0.3.1"}

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.3.1](https://github.com/hindermath/TinyCalc/compare/v0.3.0...v0.3.1) (2026-07-13)
+
+
+### Documentation / Dokumentation
+
+* synchronize active Level-2 environment registry ([4ca2bba](https://github.com/hindermath/TinyCalc/commit/4ca2bba479d02e9762d8f4be9c7853c98440f0c3))
+
+
+### Maintenance / Wartung
+
+* migrate to Antigravity CLI ([548b8e9](https://github.com/hindermath/TinyCalc/commit/548b8e90394da40c8831a18860efda78a8dae16f))
+* **toolchain:** sync agentic maintenance baseline ([c6f1769](https://github.com/hindermath/TinyCalc/commit/c6f1769e96e4982500c4de0d1058f1d7c73ccae6))
+
 ## [0.3.0](https://github.com/hindermath/TinyCalc/compare/v0.2.1...v0.3.0) (2026-07-10)