Revert "docs(review): add risk-based read-only agent gates"

This reverts commit e9e6dede7a.

scripts/validate_harness_governance.py

@@ -611,36 +611,14 @@ def validate_gitea_artifacts(root: Path) -> list[Finding]:
         require_markers(
             root,
             ".gitea/ISSUE_TEMPLATE/task.md",
-            (
-                "task_id:",
-                "task_file:",
-                "context_ref:",
-                "write_paths:",
-                "lease_until:",
-                "review_mode:",
-                "writer:",
-                "test_reviewer:",
-                "risk_reviewer:",
-            ),
+            ("task_id:", "task_file:", "context_ref:", "write_paths:", "lease_until:"),
         )
     )
     findings.extend(
         require_markers(
             root,
             ".gitea/PULL_REQUEST_TEMPLATE.md",
-            (
-                "Closes #",
-                "task_file:",
-                "context_ref:",
-                "candidate_sha:",
-                "write_paths:",
-                "验证证据",
-                "review_mode:",
-                "测试评审",
-                "安全/架构评审",
-                "reviewed_sha",
-                "verdict",
-            ),
+            ("Closes #", "task_file:", "context_ref:", "write_paths:", "验证证据"),
         )
     )
     workflow = ".gitea/workflows/harness-governance.yml"