Contract framework with markdown-native contracts utilizing fenced YAML blocks

examples/documents/concept-note-valid.md

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+---
+document_type: concept-note
+concept_id: contract-diagnostic-model
+status: draft
+---
+
+# Contract Diagnostic Model
+
+## Definition
+
+A contract diagnostic model is the shared representation for validation,
+assessment, and repair findings emitted by Markitect pipeline tools.
+
+## Assertions
+
+The central claim is that authors and agents need one diagnostic vocabulary
+across structural checks, field checks, metric bands, and semantic assessments.
+Evidence comes from the way legacy Markitect scattered related failures across
+different subsystems.
+
+## Relationships
+
+The model relates to document contracts, form fields, section specifications,
+and future LLM rubric adapters.