Migrate from poetry to uv and from black to ruff

[eecavanna]

On this branch, I migrated the codebase from using Poetry as its package manager to using uv, and from using black as its code formatter to using ruff. I updated all documentation and GitHub Actions workflows accordingly. I also documented the use of ruff as a linter, since it provides that functionality (unlike black). Finally, I formatted the code by running $ uv run ruff format.

[Copilot]

Pull Request Overview

This PR migrates the project from Poetry to uv as the package manager and from black to ruff for code formatting and linting. The migration updates all tooling configuration, documentation, and CI/CD workflows to use the new tools.

Key changes include:

• Complete migration from Poetry to uv package management with updated dependency specifications and build configuration
• Replacement of black with ruff for both code formatting and linting functionality
• Updated documentation and GitHub Actions workflows to reflect the new tooling

Reviewed Changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated 2 comments.

File	Description
pyproject.toml	Complete restructure from Poetry format to modern Python packaging with uv build backend and ruff configuration
README.md	Updated development instructions to use uv commands instead of Poetry and documented ruff usage
.github/workflows/*.yml	Migrated CI workflows from Poetry/Python setup to uv with proper caching configuration
refscan/*.py	Code formatting changes applied by ruff format removing extra blank lines

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