Add Regression Testing Guidance to AGENTS.md

1. Overview

This ticket proposes a minor but important enhancement to the AGENTS.md guidelines, specifically by adding a cross-reference to the unit testing guide for bug fixes. This will encourage the AI agent to create regression tests to prevent reoccurring bugs.

2. Scope of Work

2.1. Integrate Regression Testing Guidance into AGENTS.md

• Task: Add a specific instruction for bug fixes within the "4. Verify" step of the "Development Workflow" section in AGENTS.md.
• Implementation:
  • Add the following text to step 4: "For bug fixes, ensure you've created regression tests (see learn/guides/UnitTestingWithSiesta.md for guidance)."
  • This provides a clear action item and a direct reference to the relevant testing guide without cluttering the core workflow document.

3. Acceptance Criteria

• AGENTS.md is updated to include the regression testing guidance in the "4. Verify" step.
• The reference to learn/guides/UnitTestingWithSiesta.md is accurate.