ci: bootstrap ruff in dev tooling and workflows

[Copilot]

This PR introduces Ruff as a baseline linting tool in project tooling and CI/CD, while intentionally ignoring all files for now. It establishes the scaffolding needed for incremental module-by-module Ruff adoption in follow-up PRs.

• Dev dependency + Ruff baseline config

  • Add ruff to project.optional-dependencies.dev in pyproject.toml.
  • Add a minimal Ruff config that ignores all files by default.

• CI/CD workflow integration

  • Add ruff check . to:
    • .github/workflows/test.yaml
    • .github/workflows/release.yaml
  • Ruff now runs as part of existing automated checks without enforcing module linting yet.

• Contributor docs alignment

  • Update docs/contributing.md to include Ruff in the documented .[dev] toolchain.

[tool.ruff]
exclude = ["**/*"]

[github-actions]

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[codecov]

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[RussellSB]

/oc hello

[RussellSB]

/oc what does this PR do? What is Ruff, and why is it worth it for open source (this is a test to make sure opencode is connected)

[opencode-agent]

What This PR Does

This PR bootstraps Ruff into pytrendy's tooling as scaffolding for future module-by-module adoption:

1. Adds ruff as a dev dependency (pyproject.toml:54)
2. Adds baseline Ruff config that intentionally excludes all files (pyproject.toml:82-83)
3. Integrates ruff check . into both test.yaml and release.yaml CI workflows
4. Updates contributing.md to document Ruff in the dev toolchain

Since it excludes all files, it's a no-op lint step — just getting the plumbing in place.

---

What Is Ruff?

Ruff is a Python linter and formatter written in Rust. It replaces multiple tools (flake8, isort, pyupgrade, autopep8, etc.) in a single, extremely fast binary.

Why it's worth it for open source:

Benefit	Detail
Speed	10–100x faster than flake8/pylint. CI runs in seconds, not minutes.
Single tool	Replaces flake8, isort, pyupgrade, and more — fewer configs to maintain.
Auto-fix	Many rules have safe auto-fixers (ruff check --fix).
Rust performance	No Python startup overhead; scales to huge repos.
Growing ecosystem	Adopted by FastAPI, Pandas, uv, and most major Python OSS projects.
Zero config defaults	Sensible out of the box; opt-in to stricter rules.

For a project like pytrendy with CI on every PR, Ruff catches style and correctness issues instantly — before pytest even runs — at negligible CI cost.

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