Document mise setup task for JS/Node dependency installation

[newhook]

Summary

This PR documents how to configure the mise setup task for JavaScript/Node.js projects that require dependency installation (npm/pnpm/yarn). Rather than automating npm install, we provide clear documentation on how users can configure this for their specific project needs.

Changes:

• Added "Mise Setup Task for JavaScript Projects" section to README with examples for npm, pnpm, and yarn
• Updated mise.tmpl template with uncommented [tasks] section and clearer examples covering npm, pnpm, yarn, pip, and bundle install

Motivation

The tool runs mise install and mise setup but doesn't automatically run npm install for JS dependencies. Instead of trying to detect and auto-run the correct package manager, this approach:

• Gives users control over their dependency installation
• Works with any package manager (npm, pnpm, yarn)
• Extends naturally to other ecosystems (Python pip, Ruby bundler)
• Runs automatically during project/worktree creation

Test plan

• Verify README documentation renders correctly
• Test co proj create with a JS project that has a configured setup task
• Test co work create runs the setup task in the new worktree

Issues resolved

• ac-l3e9: NPM Install Not Automatic
• ac-l3e9.1: Document mise setup task for JS repos
• ac-l3e9.2: Uncomment setup task in mise template

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