feat: regen proto stubs for decree v0.10.0-alpha.1

Schema spec v0.1.0 additions: ExportConfigRequest/ExportSchemaRequest
gain optional spec_version selector; Schema gains dependent_required
and validations (CEL placeholder, runtime ships separately).

Bumps SDK to 0.3.0a1 (next published proto-track version per RELEASING.md).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: zeevdr

sdk/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "opendecree"
-version = "0.2.0a1"
+version = "0.3.0a1"
 description = "Python SDK for OpenDecree — schema-driven configuration management (alpha)"
 readme = "README.md"
 license = "Apache-2.0"