feat(report): close v2 headline and coverage gaps

scripts/verify_v2_event_coverage.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -ne 2 ]]; then
+  echo "用法: scripts/verify_v2_event_coverage.sh YYYY-MM-DD YYYY-MM-DD" >&2
+  exit 2
+fi
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+cd "$REPO_ROOT"
+go run -tags llm_script scripts/report_event_coverage.go "$1" "$2"