Initial shared Copilot resources scaffold

docs/governance.md

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+# Governance
+
+## Scope
+
+This repository stores shared Copilot resources, the tooling needed to install
+them, and the documentation required to maintain them.
+
+## Decision Rules
+
+- Prefer portable workflows over tool-specific duplication.
+- Prefer additive changes over breaking changes.
+- Prefer repo-first authoring when the work is intentionally shared.
+- Require publish-to-repo before considering a local resource shared.
+
+## Stewardship
+
+Project stewards review structural changes, naming conventions, lifecycle rules,
+and anything that changes propagation behavior.