[v1.x] Set Development Status classifier to Production/Stable

The 1.x line has been in wide production use for well over a year; the
classifier has read 'Beta' since the project was first published in
Nov 2024. Companion to #2975 on main.

Author: maxisbey

pyproject.toml

@@ -12,7 +12,7 @@ maintainers = [
 keywords = ["git", "mcp", "llm", "automation"]
 license = { text = "MIT" }
 classifiers = [
-    "Development Status :: 4 - Beta",
+    "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",