docs(readme): disclose how AI is used to build OpenScreen

[EtienneLescot]

Adds a short "How OpenScreen is built" section to the README, before the license.

It says plainly that most of the code since v1.5.0 is written by AI coding agents directed and reviewed by the maintainer, and lists the safeguards: every change through a reviewed PR, CI on every PR, a manual end-to-end pass on real machines before releases, before/after measurements for performance changes, and the public AGENTS.md.

Why now: some directories, LinuxLinks for one, only consider AI-heavy projects that disclose it publicly. It's also simply the honest description of the project.

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• README.md

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| What one programmer can do in one month, two programmers can do in two months. - Frederick P. Brooks |
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[EtienneLescot]

Not needed.