GitHub workflow files have invalid description top-level key (ignored by Actions)

Bug

The \description\ key at the top level of several GitHub Actions workflow YAML files is not a valid/recognized schema key. Valid top-level keys are: \
ame\, \ un-name\, \on\, \permissions\, \env\, \defaults\, \concurrency\, \jobs\. These \description\ fields are silently ignored by GitHub Actions.

Affected files:

• \.github/workflows/auto-close-duplicates.yml\ line 2
• \.github/workflows/backfill-duplicate-comments.yml\ line 2
• \.github/workflows/claude-dedupe-issues.yml\ line 2