Function validateArticleContent

validateArticleContent(
    html: string,
    _language: string,
    articleType: string,
): ContentValidationResult
Validate the quality of a generated article.

Checks performed:
- Minimum word count threshold for the given article type
- Presence of un-replaced placeholder/template markers
- Existence of required structural HTML elements
Parameters
- html: string
  Complete HTML string of the generated article
- _language: string
  Language code of the article (reserved for future language-consistency checks)
- articleType: string
  Article category string (e.g. "week-ahead")
Returns ContentValidationResult
Structured validation result with errors, warnings and metrics
- Defined in src/utils/content-validator.ts:129