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-quick-dev/step-oneshot.md

@@ -0,0 +1,49 @@
+---
+deferred_work_file: '{implementation_artifacts}/deferred-work.md'
+---
+
+# Step One-Shot: Implement, Review, Present
+
+## RULES
+
+- YOU MUST ALWAYS SPEAK OUTPUT in your Agent communication style with the config `{communication_language}`
+- NEVER auto-push.
+
+## INSTRUCTIONS
+
+### Implement
+
+Implement the clarified intent directly.
+
+### Review
+
+Invoke the `bmad-review-adversarial-general` skill in a subagent with the changed files. The subagent gets NO conversation context — to avoid anchoring bias. If no sub-agents are available, write the changed files to a review prompt file in `{implementation_artifacts}` and HALT. Ask the human to run the review in a separate session and paste back the findings.
+
+### Classify
+
+Deduplicate all review findings. Three categories only:
+
+- **patch** — trivially fixable. Auto-fix immediately.
+- **defer** — pre-existing issue not caused by this change. Append to `{deferred_work_file}`.
+- **reject** — noise. Drop silently.
+
+If a finding is caused by this change but too significant for a trivial patch, HALT and present it to the human for decision before proceeding.
+
+### Commit
+
+If version control is available and the tree is dirty, create a local commit with a conventional message derived from the intent. If VCS is unavailable, skip.
+
+### Present
+
+1. Open all changed files in the user's editor so they can review the code directly:
+   - Resolve two sets of absolute paths: (1) the repository root (`git rev-parse --show-toplevel` — returns the worktree root when in a worktree, project root otherwise; if this fails, fall back to the current working directory), (2) each changed file. Run `code -r "{absolute-root}" <absolute-changed-file-paths>` — the root first so VS Code opens in the right context, then each changed file. Always double-quote paths to handle spaces and special characters.
+   - If `code` is not available (command fails), skip gracefully and list the file paths instead.
+2. Display a summary in conversation output, including:
+   - The commit hash (if one was created).
+   - List of files changed with one-line descriptions. Use CWD-relative paths with `:line` notation (e.g., `src/path/file.ts:42`) for terminal clickability. No leading `/`.
+   - Review findings breakdown: patches applied, items deferred, items rejected. If all findings were rejected, say so.
+3. Offer to push and/or create a pull request.
+
+HALT and wait for human input.
+
+Workflow complete.