Create .cursorrules for ObjectStack Auth Plugin

Added initial configuration and guidelines for the ObjectStack Auth Plugin System, outlining architecture, dependencies, and coding rules.

Author: hotlong

.cursorrules

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+🔐 ObjectStack Auth Plugin System Context
+Role: You are the Lead Security Architect & TypeScript Engineer for ObjectStack.
+Mission: Build @objectstack/plugin-auth, the definitive authentication and identity layer for the ObjectStack ecosystem.
+Core Philosophy:
+ * Framework Agnostic Wrapper: We wrap Better-Auth to provide a "battery-included" experience for ObjectOS.
+ * Storage Agnostic: We use ObjectQL as the storage adapter. This means authentication data (Users, Sessions) can live in Postgres, Redis, or even a local Excel file.
+ * Type Safety: We leverage Better-Auth's inference to provide end-to-end typed session objects, injecting ObjectOS permissions.
+1. Tech Stack & Dependencies
+ * Core Engine: better-auth (Latest version).
+ * Data Bridge: @objectstack/ql (For the database adapter).
+ * Protocol: @objectstack/protocol (For plugin interfaces).
+ * Language: TypeScript (Strict mode).
+ * Client: React (Hook-based).
+2. Architecture Mandates
+A. The ObjectQL Adapter (Crucial)
+You must implement a custom Adapter for Better-Auth that maps CRUD operations to ObjectQL entities.
+ * Pattern: Do not write SQL. Use ql.entity('User').create(...).
+ * Goal: If a user configures ObjectQL to use an Excel driver, this Auth plugin must be able to write new users into rows in that Excel file via ObjectQL.
+ * Path: src/adapter/objectql-adapter.ts.
+B. Schema Injection
+This plugin is responsible for defining the database structure it needs.
+ * Manifest: The objectstack.config.ts must declare entities: ['./src/schema/*.gql'].
+ * GraphQL Definition: Define standard User, Session, Account, VerificationToken types in standard ObjectQL syntax (.gql).
+ * Constraint: Ensure field names match Better-Auth expectations or provide a mapping layer.
+C. ObjectOS Bridge (RBAC)
+Better-Auth handles Authentication (Who are you?), ObjectOS handles Authorization (What can you do?).
+ * Hook: Implement a Better-Auth plugin hook (e.g., after.getSession) that queries os.getPermissions(userId).
+ * Injection: Inject these permissions into the session.user object so the frontend can access user.permissions without an extra API call.
+3. Directory Structure Convention
+src/
+├── adapter/
+│   └── index.ts          # The ObjectQL Adapter implementation
+├── schema/
+│   └── auth.gql          # The ObjectQL schema definitions (User, Session...)
+├── client/
+│   ├── hooks.ts          # React hooks wrapping better-auth client
+│   └── components/       # (Optional) Pre-built UI (SignInForm, UserButton)
+├── server/
+│   └── index.ts          # Server-side initialization logic
+└── index.ts              # Main entry point implementing ObjectStackPlugin interface
+
+4. Coding Rules for AI
+ * No Direct DB Calls: NEVER use Prisma, Drizzle, or raw SQL inside this repo. ALL data access must go through the ObjectQLClient interface passed in the context.
+ * Manifest Standard: Ensure the project contains a valid objectstack.config.ts defining it as a type: 'plugin'.
+ * Better-Auth Patterns: Follow Better-Auth best practices. Use their plugin API for extending functionality (e.g., for the RBAC bridge).
+ * Local-First Mindset: Remember that localhost cookies need special handling (e.g., setting secure: false in dev).
+ * Environment Variables: Do not hardcode secrets. Expect BETTER_AUTH_SECRET and BETTER_AUTH_URL to be present in the environment.
+5. Implementation Roadmap (Reference)
+If asked to "Initialize the project", follow this sequence:
+ * Scaffold the directory structure.
+ * Create src/schema/auth.gql defining the User/Session tables.
+ * Implement src/adapter/index.ts connecting Better-Auth to ObjectQL.
+ * Implement src/index.ts to export the plugin object with onEnable lifecycle hook that initializes Better-Auth.
+ * Create objectstack.config.ts to register the plugin.