Initial shared Copilot resources scaffold

docs/naming.md

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+# Naming Standards
+
+## General
+
+- Use lowercase kebab-case for directory names and skill names.
+- Keep filenames descriptive and stable.
+- Match skill directory names to the `name` field in `SKILL.md`.
+
+## File Conventions
+
+- Prompts end in `.prompt.md`
+- Instructions end in `.instructions.md`
+- Agents end in `.agent.md`
+- Hooks end in `.json`
+
+## Frontmatter
+
+- Always include a meaningful `description` for skills, prompts, and agents.
+- Keep descriptions discovery-oriented: include what the resource does and when
+  to use it.