feat: Publish the dual-editor package to npm #370

Description

Publish @openworkflowspec/dual-editor to npm and integrate it with the existing release process.

Motivation

Make the Dual Editor available to external consumers.

Proposed Implementation

• Publish @openworkflowspec/dual-editor initial version to npm.
• Configure npm OIDC for the package so the existing GitHub Actions release workflow can publish it automatically.

Definition of Done

• Implementation: Fully implemented according to the Open 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.