extension for ref resolve, explode, implode, weave, tangle

examples/migration/legacy-explode-source.md

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+---
+title: Legacy Explode Successor
+---
+
+Opening material that used to be easy to lose in section-only exports.
+
+# Overview
+
+The successor explode flow preserves preamble, headings, order, and frontmatter.
+
+## Detail
+
+Nested sections remain addressable and roundtrip through the manifest.
+
+# Follow-Up
+
+Later sections keep their document order.