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/loggers/lib/--env-vars-reader.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# -------------------------------------------------------------------------------------
+#   archify-vscode-ext Agent Skill (MIT)
+# -------------------------------------------------------------------------------------
+
+export LOGGER_IS_ENABLED_INFO="${LOGGER_IS_ENABLED_INFO:-true}"
+export LOGGER_IS_ENABLED_ERROR="${LOGGER_IS_ENABLED_ERROR:-true}"

scripts/.scripts/loggers/lib/--index-api.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# -------------------------------------------------------------------------------------
+#   archify-vscode-ext Agent Skill (MIT)
+# -------------------------------------------------------------------------------------
+
+. ./.scripts/loggers/lib/-info.sh
+. ./.scripts/loggers/lib/-error.sh

scripts/.scripts/loggers/lib/--index.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# -------------------------------------------------------------------------------------
+#   archify-vscode-ext Agent Skill (MIT)
+# -------------------------------------------------------------------------------------
+
+. ./.scripts/loggers/lib/--env-vars-reader.sh
+. ./.scripts/loggers/lib/--index-api.sh

scripts/.scripts/loggers/lib/-error.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+# -------------------------------------------------------------------------------------
+#   archify-vscode-ext Agent Skill (MIT)
+# -------------------------------------------------------------------------------------
+
+_loggers_error() {
+	if [ "${LOGGER_IS_ENABLED_ERROR}" = true ]; then
+		printf '# ERROR # %s\n' "$*" >&2
+	fi
+}

scripts/.scripts/loggers/lib/-info.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# -------------------------------------------------------------------------------------
+#   archify-vscode-ext Agent Skill (MIT)
+# -------------------------------------------------------------------------------------
+
+# Logs go to stderr; stdout is reserved for the YAML result.
+_loggers_info() {
+	if [ "${LOGGER_IS_ENABLED_INFO}" = true ]; then
+		printf '# INFO  # %s\n' "$*" >&2
+	fi
+}