code-quality

Reference for the per-language lint + static-analysis + style toolchain (ESLint/Prettier, Ruff/Bandit/mypy, RuboCop, ShellCheck/shfmt, yamllint/actionlint, Stylelint, markdownlint) — its rule relaxations and gotchas. Use when a contributor asks to "lint", "format", set up a linter for a new language, or understand why a lint rule is disabled. NOTE - the CI half described here is NOT wired up in cms-platform; read the "What actually runs" section first.