fix(migrate): use relname not table_name in pg_stat_user_tables query

pg_stat_user_tables uses relname, not table_name. The wrong column caused
the row-count verification step to abort with ERROR: column does not exist.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tooling/migrate/rename-to-nexus.sh

@@ -63,7 +63,7 @@ docker compose -p "$OLD_PROJECT" -f "$COMPOSE_FILE" stop app 2>/dev/null || true
 echo "[2/7] Capturing pre-rename row counts..."
 PRE_COUNTS=$(docker compose -p "$OLD_PROJECT" -f "$COMPOSE_FILE" exec -T postgres \
   psql -U capakraken -d capakraken -t -c \
-  "SELECT table_name, n_live_tup FROM pg_stat_user_tables ORDER BY table_name;")
+  "SELECT relname, n_live_tup FROM pg_stat_user_tables ORDER BY relname;")
 echo "$PRE_COUNTS" | head -20
 echo "..."
 
@@ -149,7 +149,7 @@ sleep 15
 echo "=== Verification ==="
 POST_COUNTS=$(docker compose -p "$NEW_PROJECT" -f "$COMPOSE_FILE" exec -T postgres \
   psql -U nexus -d nexus -t -c \
-  "SELECT table_name, n_live_tup FROM pg_stat_user_tables ORDER BY table_name;")
+  "SELECT relname, n_live_tup FROM pg_stat_user_tables ORDER BY relname;")
 echo "Post-rename row counts (sample):"
 echo "$POST_COUNTS" | head -20