chore: add AGENTS.md & CODEOWNERS

AGENTS.md

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+Guidance for AI coding agents (Copilot, Cursor, Aider, Claude, etc.) working in this repository. Human readers are welcome, but this file is written for tools.
+
+### Repository purpose
+
+This repo hosts Stream’s React Chat SDK. It provides UI component.
+
+Agents should prioritize backwards compatibility, API stability, and high test coverage when changing code.
+
+### Tech & toolchain
+
+- Language: React (Typescript)
+- Primary runtime: Node (use the version in .nvmrc via nvm use)
+- Testing: Unit/integration: Jest (+ React Testing Library).
+- CI: GitHub Actions (assume PR validation on build + tests + lint)
+- Lint/format: ESLint + Prettier (configs in repo root)
+- Styles: Import Stream styles and override via CSS layers as described in README (don’t edit compiled CSS)
+- Release discipline: Conventional Commits + automated release tooling (see commitlint/semantic-release configs).
+
+### Project layout (high level)
+
+- src/ — Components, hooks, contexts, styles, and utilities (library source).
+- scripts/ - Scripts run during the build process
+- e2e/ — Playwright specs.
+- examples/ — Example apps/snippets.
+- developers/ — Dev notes & scripts.
+
+Use the closest folder’s patterns and conventions when editing.
+
+### Configurations
+
+Root configs:
+
+- .babelrc.js
+- .gitignore
+- .lintstagedrc.fix.json
+- .lintstagedrc.json
+- .nvmrc
+- .prettierignore
+- .prettierrc
+- .releaserc.json
+- babel.config.js
+- codecov.yml
+- commitlint.config.mjs
+- eslint.config.mjs,
+- i18next-parser.config.js
+- jest.config.js
+- jest.config.js
+- playwright.config.ts
+- tsconfig.json
+
+Respect any repo-specific rules. Do not suppress rules broadly; justify and scope exceptions.
+
+### Runbook (commands)
+
+1. Install dependencies: yarn install
+2. Build: yarn build
+3. Typecheck: yarn types
+4. Lint: yarn lint
+5. Fix lint issues: yarn lint-fix
+6. Unit tests: yarn test
+
+### General rules
+
+#### Linting & formatting
+
+- Make sure the eslint and prettier configurations are followed. Run before committing:
+
+```
+yarn lint-fix
+```
+
+#### Commit / PR conventions
+
+- Keep PRs small and focused; include tests.
+- Follow the project’s “zero warnings” policy—fix new warnings and avoid introducing any.
+- For UI changes, attach comparison screenshots (before/after) where feasible.
+- Ensure public API changes include docs.
+
+#### Testing policy
+
+Add/extend tests in the matching module’s `__tests__`/ folder.
+
+Cover:
+
+- React components
+- React hooks
+- Utility functions
+- Use fakes/mocks from the test helpers provided by the repo when possible.
+
+#### Docs & samples
+
+- When altering public API, update inline docs and any affected guide pages in the docs site where this repo is the source of truth.
+- Keep sample/snippet code compilable.
+
+#### Security & credentials
+
+- Never commit API keys or customer data.
+- Example code must use obvious placeholders (e.g., YOUR_STREAM_KEY).
+- If you add scripts, ensure they fail closed on missing env vars.
+
+#### When in doubt
+
+- Mirror existing patterns in the nearest module.
+- Prefer additive changes; avoid breaking public APIs.
+- Ask maintainers (CODEOWNERS) through PR mentions for modules you touch.
+
+---
+
+Quick agent checklist (per commit)
+
+- Build the src
+- Run all tests and ensure green
+- Run lint commands
+- Update docs if public API changed
+- Add/adjust tests
+- No new warnings
+
+End of machine guidance. Edit this file to refine agent behavior over time; keep human-facing details in README.md and docs.

CODEOWNERS

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+* @oliverlaz @arnautov-anton @MartinCupela