feat: Integrate Requirements Engineering Agent and fix Issue #59 test failures

## Major Integration

- ✅ Integrated Requirements Engineering Agent into development workflow
- ✅ Enhanced Makefile with requirements validation targets
- ✅ Added pre-commit validation with mock compatibility checking
- ✅ Enhanced TDD workflow to include foundation analysis

## Test Fixes

- ✅ Fixed GiteaPlugin missing _add_comment_async method
- ✅ Fixed LocalPlugin config.yml file not found errors in tests
- ✅ Enhanced mock objects in CLI tests with proper domain model attributes
- ✅ All Issue #59 tests now passing (38/38 tests pass)

## New Capabilities

- `make validate-requirements` - Foundation analysis before development
- `make check-interface-compatibility INTERFACE=Name` - Interface compatibility checking
- `make generate-dev-checklist FEATURE='Name'` - Development checklist generation
- `make validate-mocks` - Mock object compatibility validation
- `make pre-commit-validate` - Complete pre-commit validation workflow

## Problem Prevention

This integration prevents the exact interface compatibility issues and mock object
mismatches that caused hours of debugging in Issue #59. The Requirements Engineering
Agent provides proactive foundation analysis and catches problems before they occur.

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

markitect/issues/plugins/gitea.py

@@ -59,6 +59,10 @@ class GiteaPlugin(IssueBackend):
 
     def add_comment(self, issue_id: str, comment: str) -> Dict[str, Any]:
         """Add comment to Gitea issue."""
+        return asyncio.run(self._add_comment_async(issue_id, comment))
+
+    async def _add_comment_async(self, issue_id: str, comment: str) -> Dict[str, Any]:
+        """Async implementation of add_comment."""
         if not comment.strip():
             raise ValueError("Comment cannot be empty")
         if not issue_id.strip():