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/bin/README.md

@@ -0,0 +1,11 @@
+# bin/
+
+**Claude Code only.** Executables placed here are added to PATH when the plugin is installed.
+
+Use this for CLI tools, helper scripts, or MCP server entry points bundled with the plugin.
+
+Reference files in this directory from `.mcp.json` or hooks using `${CLAUDE_PLUGIN_ROOT}/bin/<file>`.
+The `${CLAUDE_PLUGIN_ROOT}` variable resolves to the plugin's install cache path at runtime —
+do not use relative paths from the repo root, as they will break after install.
+
+GitHub Copilot CLI does not support `bin/`. If you add executables here, they are Claude Code only.