chore: sync infrastructure files with template

[dreadnode-renovate-bot]

🤖 A new version of the python template files is available.

This PR was automatically created to sync the following:

• GitHub Actions workflows
• Pre-commit hooks and configs
• Task definitions
• Editor configs and linter rules

Please review the changes carefully before merging.

---

Generated Summary:

• Updated renovate.json5 to enable Python dependency updates for versions <=3.13.
• Added a new GitHub Actions workflow (rigging_pr_description.yaml) to automatically generate and update Pull Request descriptions using an AI tool.
• Refactored template-sync.yaml to better manage GitHub Actions workflows and to use a matrix strategy for dispatching updates to multiple repositories.
• Simplified dependency handling in pyproject.toml, transitioning from a custom project to a Python project template with essential development tools included.
• Removed unnecessary files and configurations from .gitignore and .pre-commit-config.yaml.
• Updated documentation, including README changes to reflect the new project structure and features.
• Reduced supported Python versions in the testing workflow from 3.12 and 3.13 to 3.9 through 3.11.
• General cleanup and optimizations across various configuration files to streamline the project structure.

These changes aim to modernize the project setup, improve maintainability, and enhance the development workflow by integrating updated tooling and automated processes.

This summary was generated with ❤️ by rigging