Fix: Enhance uninstall safety and dynamic dependency loading

This commit introduces several critical bug fixes and robustness
improvements that make the tool safer and easier to maintain.

Key changes:
- Replaced the hardcoded core dependency list with a dynamic loader that
  reads from installed package metadata or pyproject.toml as a fallback.
- The tool is now self-protecting and prevents users from uninstalling
  its own active core dependencies, avoiding a broken state.
- Fixed a bug where the 'uninstall' command could not see or remove
  bubbled package versions.
- Made the 'rebuild-kb' and 'reset' commands more robust.

Author: 1minds3t