refactor: unify impl operation gates and correction verification

harness/tests/common/test_git_credential_recipe.py

@@ -7,6 +7,7 @@ import subprocess
 import tempfile
 import unittest
 from pathlib import Path
+from harness.tests.common.impl_contract_docs import read_contract
 
 ROOT = Path(__file__).resolve().parents[3]
 POLICY = ROOT / "harness/operations/repository-cache.md"
@@ -38,7 +39,7 @@ class GitCredentialRecipeTests(unittest.TestCase):
             self.assertIn(required, section)
         policy = POLICY.read_text(encoding="utf-8")
         self.assertIn("Lock 파일과 임시 credential helper는 실행 role 소유와 mode `0600`을 요구한다", policy)
-        delivery = REWORK.read_text(encoding="utf-8").split("### 7. 기존 PR branch 전달", 1)[1].split("###", 1)[0]
+        delivery = read_contract(REWORK).split("### 7. 기존 PR branch 전달", 1)[1].split("###", 1)[0]
         self.assertIn("#non-file-git-credential-helper", delivery)
         self.assertNotIn("필요한 temporary askpass helper", delivery)