✨ Update Taskfile and CI Workflow

[jufty-bot]

Summary

Consolidate CI into matrix-driven Taskfile workflows, with tests running across Python 3.10–3.14 and only test entries executing on pushes to main.

Changes

• Replace separate test, lint, and Docker workflows with consolidated CI matrices.
• Run install for every non-build matrix entry.
• Keep full validation on pull requests; use per-entry run_on_push to run only tests on pushes to main.
• Split formatting, linting, type, style, and aggregate checks into Taskfile tasks.
• Standardize Taskfile descriptions, section organization, default task listing, and Python test versions.
• Rely on Copier’s normal update behavior to remove retired generated workflows, including customized copies.
• Exercise the checked-in generated project’s build, checks, test matrix, and pre-commit path in root CI.
• Keep generated fixtures and contributor documentation synchronized with the template.

Validation

• task test
• pre-commit run --all-files
• Copier CLI update regression test for customized retired workflows
• Full 12-job GitHub Actions matrix

[github-actions]

🎉 This PR is included in version 1.1.0 🎉

The release is available on GitHub release

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