feat(dotnet): add domain parity backlog harness

tests/unit/test_validate_dotnet_domain_parity_backlog_v1.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+import json
+import subprocess
+import sys
+from pathlib import Path
+
+
+def test_validate_dotnet_domain_parity_backlog_passes() -> None:
+    root = Path(__file__).resolve().parents[2]
+    proc = subprocess.run(
+        [sys.executable, str(root / "tools" / "validate_dotnet_domain_parity_backlog_v1.py")],
+        cwd=root,
+        capture_output=True,
+        text=True,
+    )
+    assert proc.returncode == 0, proc.stdout + proc.stderr
+    payload = json.loads(proc.stdout)
+    assert payload["gate"] == "PASS"
+
+
+def test_validate_dotnet_domain_parity_backlog_reports_missing_target() -> None:
+    root = Path(__file__).resolve().parents[2]
+    temp = root / "Temp" / "test_wbs_10_domain_parity_backlog_bad.yaml"
+    temp.write_text(
+        "formula_id: WBS_10_DOTNET_DOMAIN_PARITY_BACKLOG_V1\ncoverage_min: 1.0\ntolerance_policy:\n  numeric_default: 0\n  text_default: exact\nparity_targets:\n  - target_id: formula_engine_timing\n    priority: 1\n  - target_id: formula_engine_sell\n    priority: 2\n",
+        encoding="utf-8",
+    )
+    proc = subprocess.run(
+        [sys.executable, str(root / "tools" / "validate_dotnet_domain_parity_backlog_v1.py"), "--backlog", str(temp)],
+        cwd=root,
+        capture_output=True,
+        text=True,
+    )
+    assert proc.returncode != 0
+    payload = json.loads(proc.stdout)
+    assert payload["gate"] == "FAIL"
+    assert "exit_stop_price missing" in payload["missing"]