[Epic 2] Shared quality tooling (Ruff, Pyright, pre-commit, pytest, MegaLinter)

[ulises-jeremias]

Summary

Establish lint/format/type/test/pre-commit and MegaLinter config parity.

CNA mapping

ESLint flat config, Prettier, husky, lint-staged, c8, .mega-linter.yml, .markdownlint.json, .jscpd.json.

Why

Mirrors CNA maturity so CI can gate PRs from day one of implementation.

Sub-issues

• Configure Ruff (lint + format) at workspace root #17 Configure Ruff (lint + format) at workspace root
• Configure Pyright type checking #18 Configure Pyright type checking
• pre-commit hooks (mirror husky + lint-staged) #19 pre-commit hooks (mirror husky + lint-staged)
• pytest + coverage thresholds (mirror c8 gates) #20 pytest + coverage thresholds (mirror c8 gates)
• markdownlint + yamllint configs #21 markdownlint + yamllint configs
• MegaLinter Python-first config (.mega-linter.yml) #22 MegaLinter Python-first config (.mega-linter.yml)

Blocks / dependencies

Blocks #7 (CI workflows need configs).

Blocked by: #2 (workspace)

Reference

Parity matrix (workspace): knowledge/create-python-app-parity-matrix.md
Reference repo: https://github.com/Create-Node-App/create-node-app