Initial shared Copilot resources scaffold

docs/release-process.md

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+# Release Process
+
+## Flow
+
+1. Add or publish the resource into this repository.
+2. Review the change against naming, review, and portability rules.
+3. Commit and push.
+4. Run `install/update.sh` or `install/update.ps1` on consuming systems, or let
+   scheduled sync pick up the change.
+5. Verify the resource appears in the expected VS Code and CLI surfaces.