fix: harden review and verifier governance

scripts/verify_build_coverage_test.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT_DIR"
+
+check_contains() {
+    local file="$1"
+    local needle="$2"
+    grep -Fq "$needle" "$file" || {
+        echo "missing in ${file}: ${needle}"
+        exit 1
+    }
+}
+
+check_contains scripts/verify_phase2.sh 'go build -o /dev/null ./scripts/fetch_openrouter.go'
+check_contains scripts/verify_phase3.sh 'go build -o /dev/null ./scripts/generate_daily_report.go ./scripts/official_import_signature_audit_query_lib.go'
+check_contains scripts/verify_phase4.sh 'cd frontend && npm run build'
+check_contains scripts/verify_phase6.sh 'go build -o /dev/null ./cmd/server'
+check_contains scripts/verify_phase6.sh 'if go build -o "$SERVER_BIN" ./cmd/server'
+
+echo "verify_build_coverage_test: PASS"