Initial shared Copilot resources scaffold

docs/ownership.md

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+# Ownership
+
+## Resource Ownership
+
+- Skills and scripts should have a clear maintainer because they affect multiple
+  surfaces.
+- Hooks require extra scrutiny because they execute code.
+- Repository overlay templates should be maintained with GitHub-side behavior in
+  mind.
+
+## Change Responsibility
+
+Whoever introduces a shared resource is responsible for documenting it,
+verifying it, and proposing deprecation guidance if it later becomes obsolete.