docs: add AI policy

[vineethasok]

Adds an AI_POLICY.md for Click UI, adapted from ClickHouse/ClickHouse's policy and tuned for a design system / component library.

Why

Set a clear, welcoming stance on AI usage so contributors can use AI tools without worrying about stigma, while keeping the bar on quality and responsibility. AI is treated as a normal developer tool — no disclosure required, but you own and review what you submit.

What's in it

• Welcome AI usage in building, testing, and maintaining the design system.
• No disclosure required — AI is a normal tool; filter out slop before sending.
• You own the output — review and understand AI-generated code as if hand-written; no automated maintainer responses.
• Where AI helps here — accessibility, functional + visual-regression test coverage, TypeScript/prop-API tightening, the CSS Modules migration, and Storybook/build tooling. New components, props, and breaking API changes ship to every consumer, so design them deliberately.
• Don't game the safety net — no weakening checks or blindly regenerating visual-regression baselines to get green CI; be conservative adding runtime dependencies since they land in every consumer's bundle.
• IP/licensing unchanged — including not copying patterns/styles from other design systems.

Also adds a short AI Policy section + TOC entry in the README pointing to the file.

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Note

Low Risk
Documentation-only; no runtime, API, or CI behavior changes.

Overview
Adds AI_POLICY.md, a contributor-facing policy that welcomes AI for Click UI work while spelling out expectations tailored to a design system (adapted from ClickHouse’s upstream policy).

The doc states AI use does not need disclosure, but authors own and review submitted code like hand-written changes. It encourages AI for accessibility, tests (including visual regression), TypeScript/prop APIs, CSS Modules migration, and tooling; it warns against weakening CI, blindly updating Chromatic baselines, careless new runtime deps, and copying other libraries’ UI without proper licensing.

README.md gains a Contributing AI Policy TOC entry and a short section linking to ./AI_POLICY.md.

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