feat(ack): bind test env to deployer and add regression mode

ACK 0.19.0 hands test-environment deploys to the deployer skill,
documents bug-fix as a first-class scenario, and adds
docs/ack/regression.yaml harvest plus a /ack regression run.

tests/test_ack_skill.py

@@ -18,18 +18,23 @@ class AckSkillContentTests(unittest.TestCase):
             "docs/ack/tasks.yaml",
             "docs/ack/knowledge.yaml",
             "docs/ack/delivery.yaml",
+            "docs/ack/regression.yaml",
             "tasks: []",
             "validate_tasks.py",
             "validate_knowledge.py",
             "validate_delivery.py",
+            "validate_regression.py",
             "select_tasks.py",
             "select_knowledge.py",
+            "select_regression.py",
             "references/kickoff.md",
             "不要修改项目的 `AGENTS.md`",
             "当前会话担任 Coordinator",
             "intents.testEnvironment",
             "运行测试环境",
             "运行版本发布",
+            "运行回归",
+            "via: deployer",
         ):
             self.assertIn(expected, content)
 
@@ -121,6 +126,12 @@ class AckSkillContentTests(unittest.TestCase):
             "scripts/validate_knowledge.py",
             "scripts/select_tasks.py",
             "scripts/select_knowledge.py",
+            "scripts/select_regression.py",
+            "scripts/validate_regression.py",
+            "templates/regression.template.yaml",
+            "templates/regression.schema.json",
+            "examples/regression.example.yaml",
+            "references/regression.md",
             "scripts/run_verification.py",
             "scripts/worker_profiles.py",
             "scripts/launch_worker.py",
@@ -131,7 +142,7 @@ class AckSkillContentTests(unittest.TestCase):
         ):
             self.assertTrue((ack_dir / relative_path).is_file(), relative_path)
         version = (ack_dir / "VERSION").read_text(encoding="utf-8").strip()
-        self.assertEqual(version, "0.18.0")
+        self.assertEqual(version, "0.19.0")
         self.assertIn(
             f'ackVersion: "{version}"',
             (ack_dir / "examples" / "tasks.example.yaml").read_text(encoding="utf-8"),
@@ -157,6 +168,7 @@ class AckSkillContentTests(unittest.TestCase):
         self.assertNotIn("allowedWorktrees:", template)
         self.assertIn("allowedWorktrees", template)
         self.assertIn('knowledgeFile: "docs/ack/knowledge.yaml"', template)
+        self.assertIn('regressionFile: "docs/ack/regression.yaml"', template)
 
 
 if __name__ == "__main__":