feat: Complete implementation of all major systems (83+ features)

Closing this MR

This merge request is outdated and has significant conflicts with the current main branch. The work has been superseded by more recent development in other branches.

Reason for closure:

• Based on an old initial commit (ace46272)
• Main branch has evolved significantly (87,553+ lines of changes)
• Work has been continued in other branches with more recent commits
• Merge conflicts are too extensive to resolve practically

Next steps:

• Current work will be merged through updated branches
• See fix/sentry-errors-database-truth-testing and dev branches for latest work