chore: Remove outdated documentation files and finalize architecture changes for Unity integration

This commit deletes the obsolete documentation files, including ACTIVITY_CONTEXT_FIX_SUMMARY.md, ACTIVITY_CONTEXT_VERIFICATION.md, ALL_FIXES_COMPLETE.md, ANALYZE_FIX.md, CI_CD_SETUP_COMPLETE.md, CI_CD_SUMMARY.md, and COMPLETE_FIX_SUMMARY.md. These files are no longer necessary following the completion of architectural updates and fixes for the Unity Flutter integration. The changes ensure a cleaner project structure and focus on the most relevant documentation moving forward.

Author: juicycleff