feat: orchestrer le pipeline M11

Co-authored-by: Codex/gpt-5.6-terra <codex-gpt-5-6-terra@agents.invalid>

pronote_sync/pipeline/steps/normalize.py

@@ -0,0 +1,31 @@
+"""Étape de normalisation et d'ordonnancement déterministe des données Pronote."""
+
+from __future__ import annotations
+
+from datetime import datetime
+
+from pronote_sync.models.pronote import PronoteData
+from pronote_sync.pipeline.steps.fetch import FetchedPronoteData
+
+
+def normalize_step(fetched: FetchedPronoteData, *, generated_at: datetime) -> PronoteData:
+    """Construit le contrat ``PronoteData`` dans un ordre déterministe.
+
+    :param fetched: Données brutes produites par :func:`fetch_step`.
+    :param generated_at: Horodatage de l'exécution fourni par l'orchestrateur.
+    :return: Données Pronote normalisées.
+    :rtype: PronoteData
+    """
+    return PronoteData(
+        lessons=sorted(fetched.lessons, key=lambda lesson: (lesson.start, lesson.id)),
+        homeworks=sorted(
+            fetched.homeworks, key=lambda homework: (homework.due_on, homework.subject, homework.id)
+        ),
+        school_events=sorted(
+            fetched.school_events,
+            key=lambda event: (event.from_date, event.to_date, event.kind.value, event.label),
+        ),
+        messages=sorted(fetched.messages, key=lambda message: (message.date, message.id)),
+        target_date=fetched.target_date,
+        generated_at=generated_at,
+    )