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/module-example-v1/lib/--index.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+#
+#       --> passed parameters are read & exported environment variables
+#
+. ./.scripts/module-example-v1/lib/--env-vars-reader.sh
+#
+#       --> required environment variables are validated for existence
+#
+. ./.scripts/module-example-v1/lib/--env-vars-validator.sh
+#
+#       --> available functions are imported/exported
+#
+. ./.scripts/module-example-v1/lib/--index-api.sh
+# -------------------------------------------------------------------------------------