Initial shared Copilot resources scaffold

resources/prompts/publish-resource.prompt.md

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+---
+name: "publish-resource"
+description: "Publish a prompt, instruction, agent, hook, or skill into the shared Copilot resource repository."
+agent: "agent"
+tools: [read, search, edit, execute]
+argument-hint: "source=<path> kind=<prompt|instruction|agent|hook|skill> name=<optional>"
+---
+
+Publish the resource into the shared repository by using the repository's
+publish script.
+
+Requirements:
+
+- Detect or confirm the resource kind.
+- Use the repository publish script instead of copying files manually.
+- Review the normalized result.
+- Summarize what changed and what should be committed.