Just Command Runner

Create readable task automation that matches the repository's installed Just version and existing justfile conventions.

Defaults

• Inspect just --version, the existing justfile/module tree, and just --list before editing. Installed capabilities and existing syntax are authoritative over this skill's examples.
• Preserve bespoke formatting. Do not rewrite a justfile with just --fmt; use just --fmt --check only when the repository explicitly treats the built-in formatter as authoritative. just --dump is inspection output, not a formatting source.
• Prefer explicit, small recipes; require() for tool dependencies; private helpers; check/write recipe pairs; and aliases after their target recipes.
• Make recipes quiet by default: prefix the recipe name with @ unless echoing commands has clear value. Recipe-level @ inverts per-line @, so never also prefix lines inside a @recipe. Never add @ to a [script] recipe: scripts are already quiet, and @ un-mutes them. See "Quiet Recipes and Command Prefixes" in references/recipes.md.
• On stock macOS, assume /bin/bash 3.2 unless the recipe explicitly selects a newer shell.
• Use the user's section-banner style when creating a new standalone justfile; existing repository organization overrides it.