split agent-docs skills

skills/agent-docs/references/child-doc-template.md

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+# Child `agent-docs/` Template Chooser
+
+Use this reference when you know you are editing a Markdown file inside `agent-docs/`, but still need to decide which child template fits.
+
+## Choose The Smallest Matching Template
+
+- Use `rule-doc-template.md` for instructions, constraints, policy, decision criteria, or workflow guidance.
+- Use `inventory-doc-template.md` for maintained lists, registries, migration queues, or cleanup backlogs.
+- Split the document if one file tries to serve both purposes and the split would reduce ambiguity.
+
+## Quick Tests
+
+- If the document mainly tells maintainers what to do and what to avoid, use the rule template.
+- If the document mainly tracks entries that need to be updated over time, use the inventory template.
+- If the document has a long list of repeated entries under one governing policy, keep the policy brief and let the inventory structure carry the list.
+
+## Compatibility Note
+
+Older repositories may still refer to `references/child-doc-template.md` as the default child template. Keep this file as the entrypoint, but point new work to the specific template that matches the document's job.