fix(chv-muse-r12fix-3): pull_memory_home 打包不再含顶层目录名（P7）

R12 真机：pull_memory_home 用 tar -czf - -C <父目录> <家目录名>
打包，解到镜像后文件落在 mirror/memory/MEMORY.md，而
MemoryFiles(mirror) 读的是 mirror/MEMORY.md——拉取与读取差
一层，host_pull_files=1 却报 memory file missing: MEMORY.md，
state-DB 备份与 host forget 同因失败。改为 -C <家目录> . 只打
包内容，MEMORY.md 直接落在镜像根；两处钉住的测试同步改形状
（旧测试本身钉的就是多一层的错误形状）。

cloud/tests/test_chv_muse_p7.py

@@ -401,7 +401,7 @@ class PullMemoryHomeTest(unittest.TestCase):
         cmd = build_pull_command(
             ["ssh", "-p", "2222", "chv@127.0.0.1"], "/home/chv/memory")
         self.assertEqual(cmd, ["ssh", "-p", "2222", "chv@127.0.0.1",
-                               "tar -czf - -C /home/chv memory"])
+                               "tar -czf - -C /home/chv/memory ."])
 
     def test_pull_with_fake_ssh(self):
         with tempfile.TemporaryDirectory() as tmp:
@@ -415,14 +415,18 @@ class PullMemoryHomeTest(unittest.TestCase):
             fake_ssh = os.path.join(tmp, "fake-ssh")
             Path(fake_ssh).write_text(
                 "#!/bin/sh\n"
-                "tar -czf - -C %s memory\n" % remote_parent)
+                "tar -czf - -C %s .\n" % remote_home)
             os.chmod(fake_ssh, 0o755)
             local = os.path.join(tmp, "local")
             result = pull_memory_home([fake_ssh], GUEST_MEMORY_HOME,
                                       local)
             self.assertEqual(result["files"], 2)
+            # round-12 修复轮（项 3，P7）：拉取不再多一层目录——
+            # MEMORY.md 直接落在镜像根，MemoryFiles 读得到。
+            self.assertEqual(Path(os.path.join(
+                local, "MEMORY.md")).read_text(), "# 记忆\n")
             self.assertIn("冰美式", Path(os.path.join(
-                local, "memory", "memory", "2026-11-07.md")).read_text())
+                local, "memory", "2026-11-07.md")).read_text())
 
     def test_pull_ssh_failure_raises(self):
         with tempfile.TemporaryDirectory() as tmp: