refactor: Make tddai framework project-agnostic and fix test configuration

FRAMEWORK DECOUPLING:
- Remove all MarkiTect-specific references from tddai core modules
- Update tddai-assistant.md to use generic examples and language
- Change CLI output from "MarkiTect Issues" to "Project Issues"
- Update coverage_analyzer.py docstring to be project-neutral

CONFIGURATION SYSTEM:
- Make tddai configuration flexible via environment variables
- Add comprehensive documentation for project setup in config.py
- Create .env.tddai and tddai-setup.sh for MarkiTect-specific config
- Support configurable workspace naming (.tddai_workspace default)

TEST INFRASTRUCTURE CLEANUP:
- Fix IssueWriter test failures caused by config validation changes
- Implement _get_test_config() helper for isolated test configurations
- Ensure all 13 IssueWriter tests pass with proper test patterns
- Maintain clean test separation and project independence

FRAMEWORK PORTABILITY:
- TDD8 methodology now completely generic and reusable
- Configuration examples for GitHub/GitLab integration
- Ready for extraction to separate repository when needed
- All 45 tests pass cleanly confirming successful refactoring

🤖 Generated with [Claude Code](https://claude.ai/code)

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

tddai-setup.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+# TDDAi environment setup for MarkiTect project
+# Source this file to configure tddai for this specific project
+
+export TDDAI_WORKSPACE_DIR=.markitect_workspace
+export TDDAI_GITEA_URL=http://92.205.130.254:32166
+export TDDAI_REPO_OWNER=coulomb
+export TDDAI_REPO_NAME=markitect_project
+
+echo "✅ TDDAi configured for MarkiTect project"
+echo "   Workspace: $TDDAI_WORKSPACE_DIR"
+echo "   Repository: $TDDAI_REPO_OWNER/$TDDAI_REPO_NAME"
+echo "   URL: $TDDAI_GITEA_URL"