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.

.agents/skills/bmad-builder-setup/scripts/cleanup-legacy.py

@@ -0,0 +1,259 @@
+#!/usr/bin/env python3
+# /// script
+# requires-python = ">=3.9"
+# dependencies = []
+# ///
+"""Remove legacy module directories from _bmad/ after config migration.
+
+After merge-config.py and merge-help-csv.py have migrated config data and
+deleted individual legacy files, this script removes the now-redundant
+directory trees. These directories contain skill files that are already
+installed at .claude/skills/ (or equivalent) — only the config files at
+_bmad/ root need to persist.
+
+When --skills-dir is provided, the script verifies that every skill found
+in the legacy directories exists at the installed location before removing
+anything. Directories without skills (like _config/) are removed directly.
+
+Exit codes: 0=success (including nothing to remove), 1=validation error, 2=runtime error
+"""
+
+import argparse
+import json
+import shutil
+import sys
+from pathlib import Path
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(
+        description="Remove legacy module directories from _bmad/ after config migration."
+    )
+    parser.add_argument(
+        "--bmad-dir",
+        required=True,
+        help="Path to the _bmad/ directory",
+    )
+    parser.add_argument(
+        "--module-code",
+        required=True,
+        help="Module code being cleaned up (e.g. 'bmb')",
+    )
+    parser.add_argument(
+        "--also-remove",
+        action="append",
+        default=[],
+        help="Additional directory names under _bmad/ to remove (repeatable)",
+    )
+    parser.add_argument(
+        "--skills-dir",
+        help="Path to .claude/skills/ — enables safety verification that skills "
+        "are installed before removing legacy copies",
+    )
+    parser.add_argument(
+        "--verbose",
+        action="store_true",
+        help="Print detailed progress to stderr",
+    )
+    return parser.parse_args()
+
+
+def find_skill_dirs(base_path: str) -> list:
+    """Find directories that contain a SKILL.md file.
+
+    Walks the directory tree and returns the leaf directory name for each
+    directory containing a SKILL.md. These are considered skill directories.
+
+    Returns:
+        List of skill directory names (e.g. ['bmad-agent-builder', 'bmad-builder-setup'])
+    """
+    skills = []
+    root = Path(base_path)
+    if not root.exists():
+        return skills
+    for skill_md in root.rglob("SKILL.md"):
+        skills.append(skill_md.parent.name)
+    return sorted(set(skills))
+
+
+def verify_skills_installed(
+    bmad_dir: str, dirs_to_check: list, skills_dir: str, verbose: bool = False
+) -> list:
+    """Verify that skills in legacy directories exist at the installed location.
+
+    Scans each directory in dirs_to_check for skill folders (containing SKILL.md),
+    then checks that a matching directory exists under skills_dir. Directories
+    that contain no skills (like _config/) are silently skipped.
+
+    Returns:
+        List of verified skill names.
+
+    Raises SystemExit(1) if any skills are missing from skills_dir.
+    """
+    all_verified = []
+    missing = []
+
+    for dirname in dirs_to_check:
+        legacy_path = Path(bmad_dir) / dirname
+        if not legacy_path.exists():
+            continue
+
+        skill_names = find_skill_dirs(str(legacy_path))
+        if not skill_names:
+            if verbose:
+                print(
+                    f"No skills found in {dirname}/ — skipping verification",
+                    file=sys.stderr,
+                )
+            continue
+
+        for skill_name in skill_names:
+            installed_path = Path(skills_dir) / skill_name
+            if installed_path.is_dir():
+                all_verified.append(skill_name)
+                if verbose:
+                    print(
+                        f"Verified: {skill_name} exists at {installed_path}",
+                        file=sys.stderr,
+                    )
+            else:
+                missing.append(skill_name)
+                if verbose:
+                    print(
+                        f"MISSING: {skill_name} not found at {installed_path}",
+                        file=sys.stderr,
+                    )
+
+    if missing:
+        error_result = {
+            "status": "error",
+            "error": "Skills not found at installed location",
+            "missing_skills": missing,
+            "skills_dir": str(Path(skills_dir).resolve()),
+        }
+        print(json.dumps(error_result, indent=2))
+        sys.exit(1)
+
+    return sorted(set(all_verified))
+
+
+def count_files(path: Path) -> int:
+    """Count all files recursively in a directory."""
+    count = 0
+    for item in path.rglob("*"):
+        if item.is_file():
+            count += 1
+    return count
+
+
+def cleanup_directories(
+    bmad_dir: str, dirs_to_remove: list, verbose: bool = False
+) -> tuple:
+    """Remove specified directories under bmad_dir.
+
+    Returns:
+        (removed, not_found, total_files_removed) tuple
+    """
+    removed = []
+    not_found = []
+    total_files = 0
+
+    for dirname in dirs_to_remove:
+        target = Path(bmad_dir) / dirname
+        if not target.exists():
+            not_found.append(dirname)
+            if verbose:
+                print(f"Not found (skipping): {target}", file=sys.stderr)
+            continue
+
+        if not target.is_dir():
+            if verbose:
+                print(f"Not a directory (skipping): {target}", file=sys.stderr)
+            not_found.append(dirname)
+            continue
+
+        file_count = count_files(target)
+        if verbose:
+            print(
+                f"Removing {target} ({file_count} files)",
+                file=sys.stderr,
+            )
+
+        try:
+            shutil.rmtree(target)
+        except OSError as e:
+            error_result = {
+                "status": "error",
+                "error": f"Failed to remove {target}: {e}",
+                "directories_removed": removed,
+                "directories_failed": dirname,
+            }
+            print(json.dumps(error_result, indent=2))
+            sys.exit(2)
+
+        removed.append(dirname)
+        total_files += file_count
+
+    return removed, not_found, total_files
+
+
+def main():
+    args = parse_args()
+
+    bmad_dir = args.bmad_dir
+    module_code = args.module_code
+
+    # Build the list of directories to remove
+    dirs_to_remove = [module_code, "core"] + args.also_remove
+    # Deduplicate while preserving order
+    seen = set()
+    unique_dirs = []
+    for d in dirs_to_remove:
+        if d not in seen:
+            seen.add(d)
+            unique_dirs.append(d)
+    dirs_to_remove = unique_dirs
+
+    if args.verbose:
+        print(f"Directories to remove: {dirs_to_remove}", file=sys.stderr)
+
+    # Safety check: verify skills are installed before removing
+    verified_skills = None
+    if args.skills_dir:
+        if args.verbose:
+            print(
+                f"Verifying skills installed at {args.skills_dir}",
+                file=sys.stderr,
+            )
+        verified_skills = verify_skills_installed(
+            bmad_dir, dirs_to_remove, args.skills_dir, args.verbose
+        )
+
+    # Remove directories
+    removed, not_found, total_files = cleanup_directories(
+        bmad_dir, dirs_to_remove, args.verbose
+    )
+
+    # Build result
+    result = {
+        "status": "success",
+        "bmad_dir": str(Path(bmad_dir).resolve()),
+        "directories_removed": removed,
+        "directories_not_found": not_found,
+        "files_removed_count": total_files,
+    }
+
+    if args.skills_dir:
+        result["safety_checks"] = {
+            "skills_verified": True,
+            "skills_dir": str(Path(args.skills_dir).resolve()),
+            "verified_skills": verified_skills,
+        }
+    else:
+        result["safety_checks"] = None
+
+    print(json.dumps(result, indent=2))
+
+
+if __name__ == "__main__":
+    main()