Cleanup Root README.md

[hcoona]

Purpose

Refresh the root README.md so it gives maintainers and contributors a clear, accurate overview of the repository's supported languages, migrated projects, onboarding path, and language-specific conventions.

Scope

Update the root README around these sections:

1. Supported Languages
2. Migrated Projects
3. Getting Started
4. Language Specific Best Practices

The README should reflect the canonical repository layout and the currently supported C#, Python, and JavaScript/TypeScript workflows.

Current status

Unresolved. The current README uses a different structure and does not yet contain the requested sections.

Out of scope

• Exhaustive per-project documentation that belongs in individual project READMEs.
• Release-runbook details that belong in workflow documentation.

[hcoona]

Progress update: I checked the current root README against the requested structure.

The issue remains unresolved. The root README still uses headings such as Why this repo exists, What's with the name?, Canonical repository layout, and Projects included, and it does not include the requested Supported Languages, Migrated Projects, Getting Started, or Language Specific Best Practices sections.

Recommended status: keep open until the README is reorganized around the requested structure.