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/hooks/hooks.json

@@ -0,0 +1,3 @@
+{
+  "hooks": {}
+}