docs: Add AGENTS.md

AGENTS.md

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+# AGENTS.md
+
+This file provides guidance for AI coding assistants working with the Craft codebase.
+
+## Package Management
+
+- **Always use `yarn`** (v1) for package management. Never use `npm` or `pnpm`.
+- Node.js version is managed by [Volta](https://volta.sh/) (currently v22.12.0).
+- Install dependencies with `yarn install --frozen-lockfile`.
+
+## Development Commands
+
+| Command | Description |
+|---------|-------------|
+| `yarn build` | Build the project (outputs to `dist/craft`) |
+| `yarn test` | Run tests |
+| `yarn lint` | Run ESLint |
+| `yarn fix` | Auto-fix lint issues |
+
+To manually test changes:
+
+```bash
+yarn build && ./dist/craft
+```
+
+## Code Style
+
+- **TypeScript** is used throughout the codebase.
+- **Prettier** with single quotes and no arrow parens (configured in `.prettierrc.yml`).
+- **ESLint** extends `@typescript-eslint/recommended`.
+- Unused variables prefixed with `_` are allowed (e.g., `_unusedParam`).
+
+## Project Structure
+
+```
+src/
+├── __mocks__/          # Test mocks
+├── __tests__/          # Test files (*.test.ts)
+├── artifact_providers/ # Artifact provider implementations
+├── commands/           # CLI command implementations
+├── schemas/            # JSON schema and TypeScript types for config
+├── status_providers/   # Status provider implementations
+├── targets/            # Release target implementations
+├── types/              # Shared TypeScript types
+├── utils/              # Utility functions
+├── config.ts           # Configuration loading
+├── index.ts            # CLI entry point
+└── logger.ts           # Logging utilities
+dist/
+└── craft               # Single bundled executable (esbuild output)
+```
+
+## Testing
+
+- Tests use **Jest** with `ts-jest`.
+- Test files are located in `src/__tests__/` and follow the `*.test.ts` naming pattern.
+- Run tests with `yarn test`.
+
+## CI/CD
+
+- Main branch is `master`.
+- CI runs tests on Node.js 20 and 22.
+- Craft releases itself using its own tooling (dogfooding).
+
+## Configuration
+
+- Project configuration lives in `.craft.yml` at the repository root.
+- The configuration schema is defined in `src/schemas/`.