declarative Markdown workflow layer

examples/workflows/assisted-review.workflow.md

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+# Assisted Review Workflow
+
+```yaml workflow
+metadata:
+  id: assisted-review-boundary
+intent:
+  summary: Show an optional assisted-generation boundary.
+steps:
+  review:
+    kind: assisted
+    optional: true
+    prompt_text: Review the generated Markdown for clarity.
+    data:
+      rubric: concise
+outputs:
+  review:
+    path: out/review.md
+    content: ${steps.review.skipped}
+permissions:
+  assisted_generation: false
+responsibilities:
+  human:
+    approves_assisted_use: true
+```