Add automated rollback script for dotfiles installation

[maxrantil]

Context

install.sh creates timestamped backup directories (.dotfiles_backup_YYYYMMDD_HHMMSS) when conflicting files exist, but there's no automated way to restore from these backups.

Problem

Manual rollback required: If installation fails or causes issues, users must manually:

1. Identify the latest backup directory
2. Remove current symlinks
3. Restore files from backup
4. Verify restoration

Risk: Manual process is error-prone and time-consuming.

Recommended Solution

Create rollback.sh script:

#\!/bin/bash
# rollback.sh - Automated dotfiles rollback

set -e

# Find latest backup
LATEST_BACKUP=$(find "$HOME" -maxdepth 1 -name ".dotfiles_backup_*" -type d | sort -r | head -1)

if [ -z "$LATEST_BACKUP" ]; then
    echo "ERROR: No backup found"
    exit 1
fi

echo "Rolling back to: $LATEST_BACKUP"
ls -lh "$LATEST_BACKUP"

read -p "Restore these files? (y/N): " -n 1 -r
if [[ \! $REPLY =~ ^[Yy]$ ]]; then
    exit 0
fi

# Remove current symlinks
# Restore files from backup
# Clean up empty backup directory

Benefits

• One-command rollback: ./rollback.sh
• Safe with confirmation prompt
• Preserves user data
• Enables confident experimentation

Testing Requirements

• Verify symlink removal
• Validate file restoration
• Test permission preservation
• Ensure cleanup of empty backup dir

Estimated Effort

45-60 minutes (implementation + testing)

Priority

High - Critical for production confidence

References

• Agent: devops-deployment-agent (recommended for deployment safety)
• Agent: security-validator (noted missing rollback capability)