chore: remove hardcoded SSH host_key from repository

Remove the hardcoded SSH private key file from version control as it should be generated dynamically or managed securely outside the repository.

Security best practices:
- Private keys should not be committed to version control
- Keys should be generated per environment
- Sensitive credentials should be managed via secure key management systems

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: vincentbergman