first commit

tests/unit/test_validate_config_strictness.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+from tools.validate_config import validate_config
+
+
+REPO_ROOT = Path(__file__).resolve().parents[2]
+
+
+def test_validate_config_rejects_missing_required_keys(tmp_path: Path) -> None:
+    invalid_cfg = tmp_path / "invalid.yaml"
+    invalid_cfg.write_text(
+        """
+meta:
+  version: 1
+context: {}
+states:
+  S00:
+    action: NONE
+    status: PENDING
+    desc: missing binding_status
+stages: {}
+transitions: {}
+invariants: {}
+""".strip(),
+        encoding="utf-8",
+    )
+
+    problems, _ = validate_config(invalid_cfg)
+    errors = [p for p in problems if p.level == "ERROR"]
+    assert errors
+    assert any("binding_status" in p.message or "binding_status" in p.path for p in errors)