Contract framework with markdown-native contracts utilizing fenced YAML blocks

examples/documents/prd-frs-valid.md

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+---
+document_type: prd-frs
+product: Markitect Tool
+owner: Platform Architecture
+---
+
+# Markitect Tool PRD And FRS
+
+## Problem
+
+Markdown pipelines often check document shape without knowing whether the
+sections contain the content needed by authors, reviewers, and generation
+agents.
+
+## Goals
+
+The product should make document contracts testable. Success metrics include
+clear diagnostics, stable CLI behavior, and examples that show how contracts
+apply to real document types.
+
+## Functional Requirements
+
+- Load Markdown contract files with fenced YAML contract blocks.
+- Check required fields and section presence.
+- Report metric bands and deterministic assertions.
+- Produce machine-readable and human-readable diagnostics.
+
+## Non-Goals
+
+The first release does not execute provider-specific LLM calls or provide a UI
+form renderer.