Standardize indentation in chkdm script for code consistency

[coderabbitai[bot]]

Issue Description

The chkdm script has inconsistent indentation throughout the codebase, mixing both 2-space and 4-space indentation patterns.

Problem

While .editorconfig specifies 2-space indentation, the existing chkdm script contains mixed indentation:

• Some sections use 2-space indentation
• Other sections use 4-space indentation
• This inconsistency makes the code harder to read and maintain

Impact

• Inconsistent code formatting affects readability
• Makes it unclear which indentation standard contributors should follow
• Can lead to further inconsistencies in future contributions
• The AGENTS.md documentation reflects this existing inconsistency

Suggested Solution

Standardize the indentation throughout the chkdm script to follow a consistent pattern (either 2-space or 4-space, preferably aligning with the .editorconfig specification).

References

• Original PR: https://github.com/PeterDaveHello/chkdomain/pull/38
• Comment discussion: https://github.com/PeterDaveHello/chkdomain/pull/38#discussion_r2380085615
• Flagged by: @gemini-code-assist[bot]
• Requested by: @PeterDaveHello