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/.claude-plugin/plugin.json

@@ -0,0 +1,8 @@
+{
+  "name": "kyberforge",
+  "displayName": "kyberforge",
+  "description": "Skills and agents for creating, maintaining, and managing a Claude Code / Copilot CLI plugin marketplace.",
+  "author": { "name": "Defame1297", "url": "https://git.dev.rkdr.net/Defame1297/" },
+  "license": "MIT",
+  "keywords": []
+}