SKILL.md: complete review to simplify it and make it read plainly

[asabirov]

Original request

https://github.com/asabirov/github-attachments/blob/main/SKILL.md need a complete review (simplify + humanize)

Problem

SKILL.md needs a full review so that it is simpler and reads in plain English.

Acceptance criteria

• SKILL.md is reviewed from start to finish and simplified.
• Its wording is rewritten in plain English (humanized), keeping every fact, command and condition.