Add a TL;DR section near the top of README.md

[DKFuH]

Summary

Add a very short TL;DR section near the top of README.md for visitors who need the project value in two or three lines.

Why this matters

The README is already much clearer, but a very short summary can help with first impressions, stars, and external linking.

Scope

• add a TL;DR block near the top of README.md
• keep it to two or three lines
• stay aligned with the current positioning of OrgScript
• do not duplicate the full quickstart

Definition of done

• README has a short TL;DR section
• the text fits the current manifesto and spec language
• the wording is concise and non-hypey

Notes

Prefer clarity over marketing language.