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/Taskfile.yml

@@ -0,0 +1,10 @@
+# https://taskfile.dev
+
+version: "3"
+
+tasks:
+  initialize-one:
+    cmds:
+      - |
+        ./.scripts/module-example-v1/api/initialize-one.sh {{.CLI_ARGS}}
+    silent: true