feat: Validate editor against specification use cases and real-world workflows

[lornakelly]

Description

Manually test the editor using workflows from the specification’s use-cases/ directory to verify correct parsing and rendering of real-world scenarios.

In addition, source set of real-world workflow examples and use them to further validate behaviour across more practical and varied cases.

Create new tickets for any issues/bugs found

Motivation

Ensure the editor behaves correctly for realistic workflow patterns by validating against both official specification use cases and real-world examples.

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.