Spec wording tightened and ecmarkup refreshed

Spec wording and grammar clarifications

• Tightened the IsUsingDeclaration wording so it applies only to plain using, with await using and using split into separate grammar cases.
• Reworded the private-elements overview to make its analogy to property kinds clearer.

Tooling and maintenance

• Bumped ecmarkup to v24.2.1 and refreshed the generated spec output.
• Made a minor readability tweak in module async evaluation by swapping an OR condition order.
• Added one commit hash to the IPR-checking skip list.

Other misc changes

• No additional changes during the rest of the week.