feat: add kyberforge plugin and rename plugin-create skill

Scaffolds the kyberforge marketplace management plugin (create-plugin and
marketplace-architect skills will live here). Renames the plugin-create
skill directory to create-plugin to match the canonical kebab-order convention.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/plugin.json

@@ -0,0 +1,11 @@
+{
+  "name": "kyberforge",
+  "description": "Skills and agents for creating, maintaining, and managing a Claude Code / Copilot CLI plugin marketplace.",
+  "author": { "name": "Defame1297", "email": "defame1297@rkdr.net" },
+  "license": "MIT",
+  "keywords": [],
+  "agents": "agents/",
+  "skills": ["skills/"],
+  "hooks": "hooks.json",
+  "mcpServers": ".mcp.json"
+}