implement six-skill gstack 2 runtime

compat/document-generate.md

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+<!-- GENERATED by scripts/gstack2/generate-skill-tree.ts; do not edit. -->
+# Compatibility alias: /document-generate
+
+This is not a public/discoverable skill. Route the legacy invocation to `$ship --mode Prepare --module document-generate`, then read [the preserved module](../skills/ship/references/legacy/document-generate.md) in full.
+
+- Tree: `ship`
+- Public mode: `Prepare`
+- Legacy internal alias: `docs-generate`
+- Dispatcher role: `internal`
+- Mandatory specialist input: `false`