Promote PyPI development status to Production/Stable

Metadata-only release. The project has shipped its stable feature surface — full v1 read catalog, v2 write groups, MCPB drag-drop bundle, in-chat auth recovery, and capability toggles in the host UI — with 351 tests across read/write/auth paths and end-to-end validation against live tenants. Beta no longer fits.

Changed

• Development Status :: 4 - Beta → 5 - Production/Stable
• Added classifiers: Intended Audience :: Information Technology, Operating System :: OS Independent, Topic :: Office/Business, Typing :: Typed, and Programming Language :: Python :: 3.13 (already covered by CI).

Upgrading

• Claude Desktop: accela-mcp-0.4.1.mcpb is functionally identical to 0.4.0; only upgrade if you want PyPI to show the new badge.
• CLI: uv tool upgrade accela-mcp.