task: Write & submit ADR for community review

[lornakelly]

Description

Capture the agreed post-MVP direction in an ADR following. Open as a PR so the community can review and comment via the PR thread. Output: an accepted ADR.

Motivation

Give the community visibility and a say in the direction, and create a durable record of the decision

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.