poc: Validate Text Editor and Language Service in vanilla Web Component #380

Description

Create a minimal PoC in examples/vanilla-web-component to validate that the text-editor and language-service work correctly when consumed through a Web Component.

The PoC does not need to become the final vanilla Web Component integration. The final Dual Editor integration is tracked separately in #369.

Motivation

Validate the architecture decided in #209, in particular the integration between Monaco, the language-service Web Worker, and a non-React Web Component host, before proceeding with the final editor integration.

Proposed Implementation

• Integrate @openworkflowspec/text-editor in the existing vanilla Web Component example.
• Verify the Monaco + Language Service Web Worker integration.
• Verify JSON schema-driven completions and diagnostics.

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.