Function isPlaceholderText

Test whether a text string is placeholder/fallback content that should be excluded from user-visible metadata (e.g. SEO keywords, descriptions).

Matches known placeholder patterns including:

• "placeholder" (case-insensitive)
• "data unavailable" / "data_unavailable" / "data-unavailable"
• "Example motion", "Example amendment", "Example group"

Keep this regex in sync with the shell quality-gate patterns in the gh-aw workflow files (.github/workflows/news-*.md).