Contract framework with markdown-native contracts utilizing fenced YAML blocks

examples/contracts/business-letter.contract.md

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+---
+title: Business Letter Contract
+version: "0.1"
+---
+
+# Business Letter Contract
+
+```yaml contract
+id: business-letter-contract-v1
+document:
+  type: business-letter
+fields:
+  recipient_name:
+    type: string
+    required: true
+    source: context.recipient.name
+  sender_name:
+    type: string
+    required: true
+    source: context.sender.name
+sections:
+  - id: greeting
+    title: Greeting
+    presence: required
+    level: 2
+  - id: body
+    title: Body
+    presence: required
+    level: 2
+    metrics:
+      words:
+        min: 40
+        max: 350
+        severity: warning
+  - id: closing
+    title: Closing
+    presence: required
+    level: 2
+rubrics:
+  - id: tone-fit
+    scope: section.body
+    criteria: The body should match the relationship and communication purpose.
+```