docs(README.md): added missing node package

[mfranzke]

Proposed changes

Added the Node package @db-ux/agent-cli to the README.md file.

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Further comments

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/docs-readme-md-added-missing-node-package

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Pull request overview

Adds @db-ux/agent-cli to the main README’s package overview, making the repo’s AI-agent tooling more discoverable alongside the other published packages.

Changes:

• Added @db-ux/agent-cli to the “Packages” table.
• Reformatted some README snippets (list indentation, JSON and ESLint config formatting) for readability/consistency.