The setup script only installed requirements.txt dependencies but not the
local package itself, causing MCP servers to fail with ModuleNotFoundError.
Changes:
- Add `pip install -e .` for servers with pyproject.toml
- Add viz-platform and contract-validator to MCP server setup
- Add symlink verification for new plugins
- Update version banner to v5.0.0
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>