Add vector-stores module: one dataset through VectorStore on pgvector, Redis, Qdrant and Elasticsearch

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01JXVi2GMQ7bR5EmbUFdDj7N

vector-stores/scripts/run-all.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# Regenerates every file in output/. Needs the four services: scripts/services-up.sh (no Docker).
+# A store whose port is closed is skipped, so the run still completes with fewer rows.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+mkdir -p output && find output -type f ! -name "13-*" -delete   # 13 is a one-off capture, see its header
+mvn -B -q clean test
+scripts/capture-1x-compile.sh >/dev/null
+ls output