[test] add examples-check target with stubbed BIN and no-network validation for example scripts

Makefile

@@ -0,0 +1,23 @@
+# Lightweight examples-check: runs all examples/*.sh with --no-interaction -q and stubbed BIN
+# This target does not perform network calls and never prompts for input.
+
+.SHELL := /bin/bash
+
+.PHONY: examples-check
+examples-check:
+	@set -euo pipefail; \
+	shopt -s nullglob; \
+	BIN_WRAPPER="$(PWD)/scripts/with_flags.sh"; \
+	failed=0; \
+	for f in examples/*.sh; do \
+		echo "[examples-check] Running $$f"; \
+		BIN="$$BIN_WRAPPER" bash "$$f" </dev/null >/dev/null 2>&1 || { \
+			echo "[examples-check] FAILED: $$f"; failed=1; \
+		}; \
+	done; \
+	if [[ $$failed -ne 0 ]]; then \
+		echo "[examples-check] Some examples failed."; \
+		exit 1; \
+	else \
+		echo "[examples-check] All examples passed (no interaction, quiet)."; \
+	fi