Add development-scripts agent skill

Ports generic-scripts-module-v1 into a routed skill: module anatomy, shared
loggers/base modules, Taskfile integration, workflows, and pattern decisions.

Fixes a latent defect in the loggers example that silenced all logging in the
module scaffold: loggers/lib/--index-api.sh now sources --env-vars-reader.sh,
and the reader preserves already-exported values so caller overrides still win.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/base/lib/local-storage/-ensure-existance-file.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+# -------------------------------------------------------------------------------------
+# IBM Confidential
+# 6949-70F, 6949-80D
+# © Copyright IBM Corp. 2018, 2024
+# US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
+# -------------------------------------------------------------------------------------
+
+. ./.scripts/loggers/lib/--index-api.sh
+
+_base_localStorage_ensureExistance_file() {
+  local FUNCTION_NAME="_base_localStorage_ensureExistance_file"
+  # _loggers_info "${FUNCTION_NAME}"
+
+  local FILE_RELATIVE_PATH="${1}"
+
+  if
+    [ -z "${FILE_RELATIVE_PATH}" ]
+  then
+    _loggers_error "${FUNCTION_NAME}"
+    _loggers_error "${FUNCTION_NAME}" "Missing mandatory 1st paramter (FILE_RELATIVE_PATH)!"
+    _loggers_error "${FUNCTION_NAME}"
+    exit 1
+  fi
+  if
+    [ ! -e "${FILE_RELATIVE_PATH}" ]
+  then
+    touch "${FILE_RELATIVE_PATH}"
+    _loggers_warn "${FUNCTION_NAME}"
+    _loggers_warn "${FUNCTION_NAME}" "Was absent -> had to create!"
+    _loggers_warn "${FUNCTION_NAME}"
+  fi
+}