chore: rename create-plugin skill to plugin-create, add project settings

Renames plugins/kyberforge/skills/create-plugin/ to plugin-create/ to match
the directory-based skill name Claude Code uses for slash commands. Adds
.claude/settings.json with kyberforge plugin enabled. Gitignores
.claude/settings.local.json (machine-local MCP permissions).

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

plugins/kyberforge/skills/plugin-create/assets/plugin-template/.claude-plugin/plugin.json

@@ -0,0 +1,8 @@
+{
+  "name": "PLUGIN_NAME",
+  "displayName": "PLUGIN_NAME",
+  "description": "PLUGIN_DESCRIPTION",
+  "author": { "name": "AUTHOR_NAME", "url": "AUTHOR_URL" },
+  "license": "MIT",
+  "keywords": []
+}