Bump version to 1.2.1 for PyPI release

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "elydora"
-version = "1.2.0"
+version = "1.2.1"
 description = "Python SDK for the Elydora tamper-evident audit platform"
 readme = "README.md"
 license = {text = "MIT"}