feat(docs): add Copilot and AGENTS instructions for automation and project behavior

Author: SMAKSS

.github/copilot-instructions.md

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+# Copilot Instructions
+
+Follow the repo’s existing patterns and tooling:
+
+- Use pnpm for scripts and installs.
+- Keep ESM imports/exports (`type: "module"`).
+- Prefer Vite library build for package output.
+- Use existing ESLint configs (root + `playground/`).
+- Keep build output under `dist/`.
+- Avoid changes to public APIs unless requested.
+
+Helpful commands:
+- `pnpm lint`
+- `pnpm typecheck`
+- `pnpm build`
+

AGENTS.md

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+# AGENTS
+
+Use these instructions for automation and assistant behavior in this repo.
+
+## Project overview
+
+- Package: `@smakss/react-scroll-direction`
+- Build: Vite library build
+- Package manager: pnpm
+- Linting: ESLint (main + playground configs)
+
+## Working rules
+
+- Prefer pnpm scripts (`pnpm run <script>`).
+- Keep changes ESM-friendly (`type: "module"`).
+- Preserve existing file structure and naming conventions.
+- Avoid large refactors unless requested.
+- Keep output in `dist/` only.
+
+## Commands
+
+- Build: `pnpm build`
+- Lint (all): `pnpm lint`
+- Lint (main): `pnpm lint:main`
+- Lint (playground): `pnpm lint:playground`
+- Typecheck (all): `pnpm typecheck`
+- Typecheck (main): `pnpm typecheck:main`
+- Typecheck (playground): `pnpm typecheck:playground`
+
+## Playground
+
+- Location: `playground/`
+- Run dev server: `pnpm -C playground dev`