Pin the predicate splitter on a quoted identifier

Soul pass 7's Y2, treating only single quotes as quoted text, survived:
no test gave the splitter a double-quoted identifier. One case now holds
an identifier containing " AND (" and checks it stays whole.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/store.test.ts

@@ -269,6 +269,7 @@ describe("PostgresStore.checkSchema", () => {
       "consumed_at IS NULL",
     ]);
     expect(predicateConditions("(s = 'x AND (y'::text)")).toEqual(["s = 'x AND (y'::text"]);
+    expect(predicateConditions('(("odd AND (name" IS NULL) AND b)')).toEqual(['"odd AND (name" IS NULL', "b"]);
     expect(predicateConditions("")).toEqual([]);
   });