feat: add skill init/check and isolate builder makefile

Give ack, builder, and deployer an explicit init/check mode that reports
missing project config instead of failing mid-work. Point builder at
makefile.builder so its contract targets do not collide with an existing
Makefile.

tests/test_ack_skill.py

@@ -35,6 +35,8 @@ class AckSkillContentTests(unittest.TestCase):
             "运行版本发布",
             "运行回归",
             "via: deployer",
+            "## ack 初始化：完成 | 部分完成 | 阻塞",
+            "加载 deployer skill 的「初始化」",
         ):
             self.assertIn(expected, content)