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/suite/Taskfile.yml

@@ -0,0 +1,11 @@
+# https://taskfile.dev
+
+version: "3"
+
+tasks:
+  run:
+    desc: "Run the skill's own checks against examples/online-shop and a scaffolded model"
+    cmds:
+      - |
+        ./.scripts/suite/api/tests--run.sh {{ .CLI_ARGS }}
+    silent: true