Restructure README for information hierarchy (TL;DR-first)

[kgohil]

Reorder (not rewrite) so the benefit/result lands immediately after the mascot + diagram, per the inverted-pyramid / front-load principle:

1. Hero (mascot + agentic-loop image) — unchanged.
2. TL;DR — punchline + the measured win (−56% files / −12% tokens / −20% time).
3. What it gives you — 4 scannable headline bullets (map · reuse-first · self-maintaining · any agent) + jump links.
4. The problem it solves — the old opening narrative, demoted to context.
5. … Before/after → How it works → Early signal → Setup → In the box (full detail) → Design stance → Inspiration.

So: TL;DR → what it enables → important → less important. Docs-only; no version change.