chore: add agents.md

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 Node.js SDK in TypeScript. It provides:
+• A comprehensive client for Stream's Chat, Video, and Feeds (v3) APIs
+• Server-side SDK for building chat, video calling, and activity feeds
+• Support for all Stream services: Chat, Video, Feeds (v3), and Moderation
+
+Agents should prioritize backwards compatibility, API stability, and high test coverage when changing code.
+
+### Tech & toolchain
+
+• Language: TypeScript (Node.js)
+• Package managers: Yarn (primary)
+• Minimum Node.js: 18.0.0 or newer (see package.json engines)
+• Runtime targets: Node.js 18+, Node.js 20+, Node.js 22+, Bun 1+
+• CI: GitHub Actions (assume PR validation on build + tests + lint)
+• Linters & docs: ESLint + Prettier
+
+### Project layout (high level)
+
+src/
+gen/ # Generated API clients and models
+chat/ # Chat API client and models
+video/ # Video API client and models
+feeds/ # Feeds API client and models
+moderation/ # Moderation API client and models
+common/ # Common API utilities
+models/ # API request and response models for all supported products
+utils/ # Utility functions (token creation, rate limiting)
+StreamClient.ts # Main client class
+StreamChatClient.ts # Chat-specific client
+StreamVideoClient.ts # Video-specific client
+StreamFeedsClient.ts # Feeds-specific client
+StreamModerationClient.ts # Moderation-specific client
+**tests**/ # Test files
+\*.test.ts # Test files for each module
+
+Use the closest folder's patterns and conventions when editing.
+
+### Local setup (Node.js)
+
+1.  Ensure Node.js 18+ is installed
+2.  Install dependencies: `yarn install`
+3.  Build the project: `yarn build`
+4.  Run tests: `yarn test`
+
+### Alternative: Package consumer check
+
+If you need to validate as a package consumer:
+
+1.  Create a throwaway sample project.
+2.  Add to package.json:
+
+```json
+{
+  "dependencies": {
+    "@stream-io/node-sdk": "^0.6.5"
+  }
+}
+```
+
+3.  Install and test the integration.
+
+### Available Scripts
+
+Common npm/yarn scripts in this repo include:
+• `build` - Build the TypeScript project to dist/
+• `test` - Run tests with Vitest
+• `test:bun` - Run tests with Bun
+• `lint` - Run ESLint
+• `lint:fix` - Run ESLint with auto-fix
+• `prettier:fix` - Run Prettier to format code
+• `generate:open-api` - Regenerate API clients from OpenAPI specs
+
+Agents should check package.json scripts before running commands.
+
+### Build & test commands (CLI)
+
+Use yarn/npm for day-to-day work; use CLI for CI parity & agent automation.
+
+Build the project:
+
+```bash
+yarn build
+```
+
+Run all tests:
+
+```bash
+yarn test
+```
+
+Run tests with Bun:
+
+```bash
+yarn test:bun
+```
+
+Run linting:
+
+```bash
+yarn lint
+```
+
+Format code:
+
+```bash
+yarn prettier:fix
+```
+
+Linting & formatting
+• ESLint and Prettier are configured for this project. Run before committing:
+
+```bash
+yarn lint
+yarn prettier:fix
+```
+
+• Respect .eslintrc and .prettierrc configurations. Do not suppress rules broadly; justify and scope exceptions.
+• The project uses lint-staged with Husky for pre-commit hooks.
+
+Commit / PR conventions
+• Use conventional commit format for commit messages.
+• Keep PRs small and focused; include tests.
+• Follow the project’s “zero warnings” policy—fix new warnings and avoid introducing any.
+• Ensure public API changes include docs and migration notes.
+
+Testing policy
+• Add/extend tests in the **tests**/ folder with .test.ts suffix.
+• Cover:
+• Core API clients and models (StreamClient, StreamChatClient, etc.)
+• Utility functions (token creation, rate limiting)
+• Generated API clients and their interactions
+
+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.
+
+Compatibility & distribution
+• Maintain compatibility with supported Node.js versions listed in package.json engines (Node.js 18+).
+• Don't introduce third-party deps without discussion.
+• Validate yarn integration and ensure the package works in both CommonJS and ES modules.
+• Test compatibility with Bun runtime when making changes.
+
+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 project: `yarn build`
+• Run tests: `yarn test`
+• Run linting: `yarn lint`
+• Format code: `yarn prettier:fix`
+• Add/adjust tests
+• No new warnings or linting errors
+
+End of machine guidance. Edit this file to refine agent behavior over time; keep human-facing details in README.md and docs.