Contract framework with markdown-native contracts utilizing fenced YAML blocks

examples/documents/business-letter-valid.md

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+---
+document_type: business-letter
+recipient_name: Ada Lovelace
+sender_name: Markitect Team
+---
+
+# Follow-Up Letter
+
+## Greeting
+
+Dear Ada Lovelace,
+
+## Body
+
+Thank you for the thoughtful discussion about structured Markdown generation.
+We reviewed the requirements and will send a concise proposal that separates
+document contracts, field prefill, validation diagnostics, and optional semantic
+assessment. This keeps the implementation practical while leaving room for
+future automation.
+
+## Closing
+
+Kind regards,
+
+Markitect Team