Close Redis clients cleanly in tests

Use Redis QUIT in key-value store tests so each test waits for the
client connection to close before Deno performs leak checks.

This avoids pending ioredis disconnect timers being reported as leaks
under Deno 2.7.13 while preserving the same test coverage.

Assisted-by: Codex:gpt-5.4

Author: dahlia

packages/redis/src/kv.test.ts

@@ -21,7 +21,7 @@ test("RedisKvStore.get()", { ignore }, async () => {
     await redis.set(`${keyPrefix}foo::bar`, '"foobar"');
     assert.strictEqual(await store.get(["foo", "bar"]), "foobar");
   } finally {
-    redis.disconnect();
+    await redis.quit();
   }
 });
 
@@ -32,7 +32,7 @@ test("RedisKvStore.set()", { ignore }, async () => {
     await store.set(["foo", "baz"], "baz");
     assert.strictEqual(await redis.get(`${keyPrefix}foo::baz`), '"baz"');
   } finally {
-    redis.disconnect();
+    await redis.quit();
   }
 });
 
@@ -44,7 +44,7 @@ test("RedisKvStore.delete()", { ignore }, async () => {
     await store.delete(["foo", "baz"]);
     assert.equal(await redis.exists(`${keyPrefix}foo::baz`), 0);
   } finally {
-    redis.disconnect();
+    await redis.quit();
   }
 });
 
@@ -68,7 +68,7 @@ test("RedisKvStore.list()", { ignore }, async () => {
     assert(entries.some((e) => e.key[1] === "nested"));
   } finally {
     await redis.flushdb();
-    redis.disconnect();
+    await redis.quit();
   }
 });
 
@@ -88,7 +88,7 @@ test("RedisKvStore.list() - single element key", { ignore }, async () => {
     assert.strictEqual(entries[0].value, "value-a");
   } finally {
     await redis.flushdb();
-    redis.disconnect();
+    await redis.quit();
   }
 });
 
@@ -108,6 +108,6 @@ test("RedisKvStore.list() - empty prefix", { ignore }, async () => {
     assert.strictEqual(entries.length, 3);
   } finally {
     await redis.flushdb();
-    redis.disconnect();
+    await redis.quit();
   }
 });