v2: Commands DSL - Add command() function and update CommandMetadata

[javiertoledo]

Parent

Part of #739

Status: Completed

This work was completed in PR #733.

What Was Done

1. Created command() DSL function in packages/core/src/dsl/command.ts

   • Functional API: command(name, options, handler)
   • Auto-registers commands in Magek.config.commandHandlers
   • Supports authorization, before hooks, and property metadata

2. Updated CommandMetadata in packages/common/src/concepts/command.ts

   • Changed from class: CommandInterface<TCommand> to handler: CommandHandler<TInput, TResult>
   • Added name: string property
   • Defined CommandHandler type for type safety

3. Updated CommandDispatcher in packages/core/src/command-dispatcher.ts

   • Now calls commandMetadata.handler(input, register) directly
   • No longer instantiates classes at runtime

4. Reimplemented @Command decorator in packages/core/src/decorators/command.ts

   • Thin wrapper around the DSL command() function
   • Creates an adapter handler that instantiates classes for backwards compatibility

5. Updated GraphQL infrastructure

   • TargetTypeMetadata uses name instead of class
   • Added generateGraphQLTypeForMetadata() for metadata-based type generation
   • Created commandMetadataToTargetTypes() transform

6. Updated all tests to use handler-based metadata format

   • 327 tests passing in @magek/core

Related Issues

• v2: Review and harden command DSL design #741 — Follow-up: Review and harden command DSL design
• v2: Add comprehensive tests for command DSL #748 — Follow-up: Add comprehensive tests for command DSL