Add archify-vscode-ext skill: Archify diagrams and models for the Archify Diagram Viewer extension

Model tasks (validate, list, scaffold, resolve), diagram tasks (validate,
render), the bundled Archify 3.0.1 runtime and yaml parser under
scripts/vendor, references for authoring, formats and folders, and the
online-shop example model.

scripts/.scripts/runtime/lib/-archify--sync.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# -------------------------------------------------------------------------------------
+#   archify-vscode-ext Agent Skill (MIT)
+# -------------------------------------------------------------------------------------
+
+# Refreshes vendor/archify and vendor/yaml from local checkouts.
+# Flags: [<archify-checkout>] [--yaml-src <node_modules/yaml>]; see src/tools/sync-archify.mjs.
+_runtime__archify__sync() {
+	_loggers_info "Syncing the Archify runtime into vendor/"
+	node ./src/tools/sync-archify.mjs "$@"
+}