Document and enforce prerequisites

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Problem Statement

First run could use some polish

### Proposed Solution

Update documentation to include a must have as well as a nice to have section. When running KTF detect if any prerequisites are missing and exit / error message as appropriate

### Additional information

_No response_

### Acceptance Criteria

- [ ] Instructions from a clean install are sensible
- [ ] Any missing prerequisites are detected if / when missing

Review the repository's clean-install instructions and the KTF startup path to identify where prerequisites are documented and checked. Verify the clean-install flow, document must-have and nice-to-have prerequisites, and confirm missing prerequisites produce an appropriate error or exit.

Written by the indexing model from the issue text.