feat: Publish package on npm

[lornakelly]

Description

Publish the editor package to the npm registry so it can be consumed as a dependency by host applications.

Motivation

Host applications can only integrate via a published package

Proposed Implementation

No response

Definition of Done

• Implementation: Fully implemented according to the Serverless Workflow spec.
• Unit Tests: Comprehensive unit tests are included and passing.
• Integration Tests: Verified within the monorepo and target environments (Web/VS Code).
• Documentation: Updated README.md, ADRs, or official docs.
• Performance: No significant regression in editor responsiveness.
• Accessibility: UI changes comply with accessibility standards.