v1.3.0

Added

• Add optional plain-text footer_text and watermark_text to HTML and PDF
  renderers, shared by sync and async applications. Defaults remain unchanged.
• Document the ksef2[pdf] installation extra in English and Polish quickstarts.

Fixed

• Parse existing FA(3) invoices without draft business rules, with opt-in XSD
  validation. Render ZAL advances independently of their order value and allow zero
  quantity on KOR after-correction rows when building drafts.
• Preserve declared order values without requiring equality with supplied lines.
• Detect unsupported FA(2) XML explicitly and provide actionable parse/render
  hints with structured field, schema, namespace and local-rule context.
• Reduce verification QR spacing so it stays on the preceding PDF page when
  the code and assigned number fit.
• Record the published 1.2.0 compatibility baseline.