feat: Calculer automatiquement les moyennes après chaque saisie de notes

Les enseignants ont besoin de moyennes à jour immédiatement après la
publication ou modification des notes, sans attendre un batch nocturne.

Le système recalcule via Domain Events synchrones : statistiques
d'évaluation (min/max/moyenne/médiane), moyennes matières pondérées
(normalisation /20), et moyenne générale par élève. Les résultats sont
stockés dans des tables dénormalisées avec cache Redis (TTL 5 min).

Trois endpoints API exposent les données avec contrôle d'accès par rôle.
Une commande console permet le backfill des données historiques au
déploiement.

_bmad-output/implementation-artifacts/sprint-status.yaml

@@ -0,0 +1,166 @@
+# generated: 2026-01-29
+# project: classeo
+# project_key: classeo
+# tracking_system: file-system
+# story_location: _bmad-output/implementation-artifacts
+
+# STATUS DEFINITIONS:
+# ==================
+# Epic Status:
+#   - backlog: Epic not yet started
+#   - in-progress: Epic actively being worked on
+#   - done: All stories in epic completed
+#
+# Epic Status Transitions:
+#   - backlog → in-progress: Automatically when first story is created (via create-story)
+#   - in-progress → done: Manually when all stories reach 'done' status
+#
+# Story Status:
+#   - backlog: Story only exists in epic file
+#   - ready-for-dev: Story file created in stories folder
+#   - in-progress: Developer actively working on implementation
+#   - review: Ready for code review (via Dev's code-review workflow)
+#   - done: Story completed
+#
+# Retrospective Status:
+#   - optional: Can be completed but not required
+#   - done: Retrospective has been completed
+#
+# WORKFLOW NOTES:
+# ===============
+# - Epic transitions to 'in-progress' automatically when first story is created
+# - Stories can be worked in parallel if team capacity allows
+# - SM typically creates next story after previous one is 'done' to incorporate learnings
+# - Dev moves story to 'review', then runs code-review (fresh context, different LLM recommended)
+
+generated: 2026-01-29
+project: classeo
+project_key: classeo
+tracking_system: file-system
+story_location: _bmad-output/implementation-artifacts
+
+development_status:
+  # Epic 1: Fondations, Auth & Observabilité (9 stories)
+  epic-1: done
+  1-1-setup-projet-infrastructure: done
+  1-2-foundation-multi-tenant: done
+  1-3-inscription-et-activation-compte: done
+  1-4-connexion-utilisateur: done
+  1-5-reinitialisation-mot-de-passe: done
+  1-6-gestion-sessions: done
+  1-7-audit-trail-actions-sensibles: done
+  1-8-observabilite-monitoring: done
+  1-9-dashboard-placeholder-avec-preview-score-serenite: done
+  epic-1-retrospective: optional
+
+  # Epic 2: Configuration Établissement (13 stories)
+  epic-2: done
+  2-1-creation-et-gestion-des-classes: done
+  2-2-creation-et-gestion-des-matieres: done
+  2-3-gestion-des-periodes-scolaires: done
+  2-4-configuration-mode-de-notation: done
+  2-5-creation-comptes-utilisateurs: done
+  2-5b-messaging-asynchrone-fiable: done
+  2-6-attribution-des-roles: done
+  2-7-liaison-parents-enfants: done
+  2-7b-conversion-mobile-first: done
+  2-8-affectation-enseignants-aux-classes-et-matieres: done
+  2-8b-pagination-et-recherche-sections-admin: done
+  2-8c-migration-utilisateurs-postgresql: done
+  2-9-designation-remplacants-temporaires: done
+  2-10-gestion-multi-etablissements-super-admin: done
+  2-11-configuration-calendrier-scolaire: done
+  2-12-consultation-liste-droit-a-limage: done
+  2-12b-optimistic-update-pages-admin: done
+  2-13-personnalisation-visuelle-etablissement: done
+  2-15-organisation-sections-dashboard-admin: done
+  epic-2-retrospective: done
+
+  # Epic 3: Import & Onboarding (5 stories)
+  epic-3: done
+  3-0-creation-manuelle-eleves: done
+  3-1-import-eleves-via-csv: done
+  3-2-import-enseignants-via-csv: done
+  3-3-generation-et-envoi-codes-invitation-parents: done
+  3-4-optimisation-pagination-et-cache-requetes: done
+  epic-3-retrospective: optional
+
+  # Epic 4: Emploi du Temps (5 stories)
+  epic-4: done
+  4-1-creation-et-modification-de-lemploi-du-temps: done
+  4-2-recurrences-hebdomadaires: done
+  4-3-consultation-edt-par-leleve: done
+  4-4-consultation-edt-par-le-parent: done
+  4-6-recherche-parent-liaison-eleve: done
+  epic-4-retrospective: optional
+
+  # Epic 5: Devoirs & Règles (8 stories)
+  epic-5: done
+  5-1-creation-de-devoirs: done
+  5-2-duplication-de-devoirs-multi-classes: done
+  5-2b-optimisation-chargement-page-devoirs: done
+  5-3-configuration-des-regles-de-devoirs: done
+  5-4-application-des-regles-mode-soft-warning: done
+  5-5-application-des-regles-mode-hard-blocage: done
+  5-6-contournement-des-regles-avec-notification: done
+  5-7-consultation-des-devoirs-par-leleve: done
+  5-8-consultation-des-devoirs-par-le-parent: done
+  5-9-description-enrichie-et-pieces-jointes-enseignant: done
+  5-10-rendu-de-devoir-par-leleve: done
+  epic-5-retrospective: optional
+
+  # Epic 6: Notes & Évaluations (8 stories)
+  epic-6: in-progress
+  6-1-creation-devaluation: done
+  6-2-saisie-notes-grille-inline: done
+  6-3-calcul-automatique-des-moyennes: in-progress
+  6-4-saisie-des-appreciations: in-progress
+  6-5-mode-competences: ready-for-dev
+  6-6-consultation-notes-par-leleve: ready-for-dev
+  6-7-consultation-notes-par-le-parent: ready-for-dev
+  6-8-statistiques-enseignant: ready-for-dev
+  epic-6-retrospective: optional
+
+  # Epic 7: Vie Scolaire (8 stories)
+  epic-7: in-progress
+  7-1-appel-en-un-ecran: ready-for-dev
+  7-2-signalement-absences: ready-for-dev
+  7-3-signalement-retards: ready-for-dev
+  7-4-justification-absence-par-le-parent: ready-for-dev
+  7-5-historique-absences-et-retards: ready-for-dev
+  7-6-gestion-dispenses-et-amenagements: ready-for-dev
+  7-7-saisie-sanctions-et-recompenses: ready-for-dev
+  7-8-consultation-vie-scolaire-par-le-parent: ready-for-dev
+  epic-7-retrospective: optional
+
+  # Epic 8: Dashboard Sérénité & Recherche (5 stories)
+  epic-8: in-progress
+  8-1-dashboard-parent-avec-score-serenite: ready-for-dev
+  8-2-configuration-et-opt-out-score-serenite: ready-for-dev
+  8-3-dashboard-enseignant: ready-for-dev
+  8-4-dashboard-direction: ready-for-dev
+  8-5-recherche-globale: ready-for-dev
+  epic-8-retrospective: optional
+
+  # Epic 9: Communication & Notifications (7 stories)
+  epic-9: in-progress
+  9-1-messagerie-enseignant-parents-eleves: ready-for-dev
+  9-2-messagerie-direction-etablissement: ready-for-dev
+  9-3-accuses-de-lecture-et-statistiques: ready-for-dev
+  9-4-notifications-push-pwa: ready-for-dev
+  9-5-notifications-email: ready-for-dev
+  9-6-preferences-de-notification: ready-for-dev
+  4-5-notifications-de-modification-edt: ready-for-dev  # Déplacée : dépend de 9.4 et 9.6
+  9-7-digest-hebdomadaire-serenite: ready-for-dev
+  epic-9-retrospective: optional
+
+  # Epic 10: Documents & Conformité (7 stories)
+  epic-10: in-progress
+  10-1-generation-bulletins-pdf: ready-for-dev
+  10-2-telechargement-bulletins: ready-for-dev
+  10-3-verrouillage-et-deverrouillage-des-notes: ready-for-dev
+  10-4-certificat-de-scolarite: ready-for-dev
+  10-5-gestion-cycle-de-vie-des-donnees: ready-for-dev
+  10-6-droits-rgpd-utilisateurs: ready-for-dev
+  10-7-passage-de-classe-et-cloture-annee: ready-for-dev
+  epic-10-retrospective: optional