commit 5de1eadfd4e969030c3a04f72fbcf445062edc0a
Author: Mika <kontakt@donau2space.de>
Date:   Sat Apr 4 17:36:38 2026 +0000

    Add artifact.001/src/artifact_001/core.py

diff --git a/artifact.001/src/artifact_001/core.py b/artifact.001/src/artifact_001/core.py
new file mode 100644
index 0000000..69bbb9c
--- /dev/null
+++ b/artifact.001/src/artifact_001/core.py
@@ -0,0 +1,73 @@
+import json
+from dataclasses import dataclass, asdict
+from datetime import datetime
+from pathlib import Path
+from typing import Any
+import os
+
+
+@dataclass
+class MeasurementLog:
+    """Repräsentiert einen einzelnen Messdatensatz."""
+
+    timestamp: datetime
+    measured_p: float
+    freeze_ok: bool
+    setup_fingerprint: str
+    policy_hash: str
+
+    def to_serializable(self) -> dict[str, Any]:
+        """Wandelt das Objekt in eine JSON-kompatible Struktur um."""
+        return {
+            "timestamp": self.timestamp.isoformat(),
+            "measured_p": self.measured_p,
+            "freeze_ok": self.freeze_ok,
+            "setup_fingerprint": self.setup_fingerprint,
+            "policy_hash": self.policy_hash,
+        }
+
+
+_OUTPUT_PATH = Path("output/measurement_log.json")
+
+
+def _validate_inputs(timestamp: datetime, measured_p: float, freeze_ok: bool, setup_fingerprint: str, policy_hash: str) -> None:
+    assert isinstance(timestamp, datetime), "timestamp muss vom Typ datetime sein"
+    assert isinstance(measured_p, (int, float)), "measured_p muss eine Zahl sein"
+    assert isinstance(freeze_ok, bool), "freeze_ok muss bool sein"
+    assert isinstance(setup_fingerprint, str) and setup_fingerprint, "setup_fingerprint darf nicht leer sein"
+    assert isinstance(policy_hash, str) and policy_hash, "policy_hash darf nicht leer sein"
+
+
+def log_measurement(timestamp: datetime, measured_p: float, freeze_ok: bool, setup_fingerprint: str, policy_hash: str) -> None:
+    """Protokolliert einen Messdatensatz als JSON-Zeile in output/measurement_log.json.
+
+    Fügt neue Einträge hinzu, ohne bestehende zu überschreiben.
+    """
+    _validate_inputs(timestamp, measured_p, freeze_ok, setup_fingerprint, policy_hash)
+
+    log_entry = MeasurementLog(
+        timestamp=timestamp,
+        measured_p=float(measured_p),
+        freeze_ok=freeze_ok,
+        setup_fingerprint=setup_fingerprint,
+        policy_hash=policy_hash,
+    ).to_serializable()
+
+    os.makedirs(_OUTPUT_PATH.parent, exist_ok=True)
+
+    current_data = []
+    if _OUTPUT_PATH.exists():
+        try:
+            with _OUTPUT_PATH.open("r", encoding="utf-8") as f:
+                content = f.read().strip()
+                if content:
+                    current_data = json.loads(content)
+                    if not isinstance(current_data, list):
+                        current_data = []
+        except (json.JSONDecodeError, OSError):
+            current_data = []
+
+    current_data.append(log_entry)
+
+    with _OUTPUT_PATH.open("w", encoding="utf-8") as f:
+        json.dump(current_data, f, indent=2, ensure_ascii=False)