test(2meet-data-optimizer): add live test runner and failing shadow_read write suite

- Add tests/live: a `wp eval-file` runner (PASS/FAIL/XFAIL/XPASS/SKIP) with
  fixtures that override entity modes in process (pre_option) and read
  native / flat values with plain SQL, so WP core meta flows run for real
- shadow_write suite reproduces the dev36 finding: in shadow_read,
  update_*_meta returns false and native meta is never written
  (3 XFAIL marked for PR-056); the dual_write control passes
- Move the dev36 integration harness into tests/live/tools; outputs go to
  cwd / $TMDO_LIVE_OUT, site URL and path are env-configurable
- Verify: wp --path=<dev36> eval-file tests/live/run.php shadow_write
  → 1 passed, 3 xfail; unit 658 OK, integration 480 OK,
  phpcs (phpcs.xml) 0, stan OK
- PR: PR-052

tests/live/tools/run_batch.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+# usage: run_batch.sh <batch-tag> <scale-divisor>
+S="$(cd "$(dirname "$0")" && pwd)/seed.php"
+cd "${TMDO_LIVE_WP_PATH:-/var/www/Studio/wp-local-dev36}"
+ B=$1; D=${2:-1}; OUT=${TMDO_LIVE_OUT:-/tmp}; LOG=$OUT/batch_$B.log
+run(){ wp eval-file $S "$@" 2>>$OUT/batch_${B}_err.log | grep SEED >> $LOG; }
+echo "== start $(date +%T)" >> $LOG
+run terms $((100/D)) ${B}
+for p in 1 2 3 4; do run vendors $((250/D)) ${B}p$p & done; wait
+for p in 1 2 3 4; do run listings $((1000/D)) ${B}p$p & done
+run requests $((500/D)) ${B} & run products $((1000/D)) ${B} & wait
+for p in 1 2; do run reviews $((2000/D)) ${B}p$p & done
+for p in 1 2; do run orders $((750/D)) ${B}p$p & done; wait
+echo "== end $(date +%T)" >> $LOG