v1.0.0

First release, by Louis Wright.

• H1 checks: missing, multiple, hidden, very short, no overlap with <title>, duplicated across pages.
• Hierarchy: skipped levels, headings before the H1 in main content, long pages without <h2>.
• Quality: empty, image-only, generic/keyword-empty, duplicate and overlong headings; configurable generic list.
• Supports role="heading"/aria-level and hidden ancestors.
• Text/JSON/SARIF/Markdown output, --fail-on, exit codes 0/1/2, allowlist with expiry, severity overrides.
• Composite GitHub Action with job summary.