prepare 0.1.0b5 release
Bump version 0.1.0b4 -> 0.1.0b5 and stamp the CHANGELOG for the opt-in
cloud MCP-client feature (Claude.ai / ChatGPT) merged in #1.
Verified: make test (589 passed), make build (django_mcp_sql-0.1.0b5 wheel +
sdist), make test-install (fresh-venv install + version cross-check OK).
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com