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/.gitignore

@@ -0,0 +1,19 @@
+# Node / pnpm
+node_modules/
+dist/
+.pnpm-store/
+
+# Build artefacts
+*.js.map
+*.d.ts.map
+
+# Environment
+.env
+.env.local
+.env.*.local
+
+# Test output
+.test-output/
+
+# OS
+.DS_Store