Task 999 is missing mock_dmesg.log and mock_journalctl.log required by its Dockerfiles

## Summary

Task `999` cannot be built because both its original and Harbor Dockerfiles copy two fixture files that are absent from the repository:

- `mock_dmesg.log`
- `mock_journalctl.log`

This appears to be an incomplete upstream task package, rather than a Harbor migration issue.

## Affected paths

- `Dataset/999/Dockerfile`
- `COPY mock_dmesg.log /var/log/mock_dmesg.log`
- `COPY mock_journalctl.log /var/log/mock_journalctl.log`
- `Harbor-Dataset/999/environment/Dockerfile`
- the same two `COPY` instructions

Neither corresponding directory contains those files.

The task instructions also explicitly require the agent to inspect:

- `/var/log/mock_dmesg.log`
- `/var/log/mock_journalctl.log`

So these are benchmark inputs, not optional build artifacts.

## Reproduction

From either task directory, attempt a Docker build:

```bash
docker build -f Dockerfile .

Start with Dataset/999/Dockerfile and Harbor-Dataset/999/environment/Dockerfile, then inspect the task instructions for the expected fixture content. Run `docker build -f Dockerfile .` from each task directory to reproduce the failure. Done means both named log fixtures are present in the required directories and both Docker builds succeed.

Written by the indexing model from the issue text.