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/-export-env-variables-from-file.sh

@@ -0,0 +1,40 @@
+#!/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
+
+. ./.scripts/base/lib/local-storage/-ensure-existance-file.sh
+
+. ./.scripts/base/lib/-export-env-variable.sh
+
+. ./.scripts/base/lib/-get-env-variable-key-from-line.sh
+. ./.scripts/base/lib/-get-env-variable-value-from-line.sh
+
+_base_exportEnvVariablesFrom_file() {
+  local FUNCTION_NAME="_base_exportEnvVariablesFrom_file"
+  local FILE_RELATIVE_PATH=${1}
+
+  _loggers_trace "${FUNCTION_NAME}" "FILE_RELATIVE_PATH: ${FILE_RELATIVE_PATH}"
+  _base_localStorage_ensureExistance_file "${FILE_RELATIVE_PATH}"
+
+  while read TMP_FILE_ENV_LINE; do
+    if
+      [ ! -z "${TMP_FILE_ENV_LINE}" ]
+    then
+
+      local TMP_KEY=$(
+        _base_getEnvVariableKey_fromLine "${TMP_FILE_ENV_LINE}"
+      )
+      local TMP_VALUE=$(
+        _base_getEnvVariableValue_fromLine "${TMP_FILE_ENV_LINE}"
+      )
+      _base_exportEnvVariable "${TMP_KEY}" "${TMP_VALUE}"
+
+    fi
+  done <"${FILE_RELATIVE_PATH}"
+}