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-testarch-ci/steps-c/step-01b-resume.md

@@ -0,0 +1,110 @@
+---
+name: 'step-01b-resume'
+description: 'Resume interrupted workflow from last completed step'
+outputFile: '{test_artifacts}/ci-pipeline-progress.md'
+---
+
+# Step 1b: Resume Workflow
+
+## STEP GOAL
+
+Resume an interrupted workflow by loading the existing progress document, displaying progress, verifying previously created artifacts, and routing to the next incomplete step.
+
+## MANDATORY EXECUTION RULES
+
+- 📖 Read the entire step file before acting
+- ✅ Speak in `{communication_language}`
+
+---
+
+## EXECUTION PROTOCOLS:
+
+- 🎯 Follow the MANDATORY SEQUENCE exactly
+- 📖 Load the next step only when instructed
+
+## CONTEXT BOUNDARIES:
+
+- Available context: Output document with progress frontmatter
+- Focus: Load progress and route to next step
+- Limits: Do not re-execute completed steps
+- Dependencies: Output document must exist from a previous run
+
+## MANDATORY SEQUENCE
+
+**CRITICAL:** Follow this sequence exactly. Do not skip, reorder, or improvise.
+
+### 1. Load Output Document
+
+Read `{outputFile}` and parse YAML frontmatter for:
+
+- `stepsCompleted` — array of completed step names
+- `lastStep` — last completed step name
+- `lastSaved` — timestamp of last save
+
+**If `{outputFile}` does not exist**, display:
+
+"⚠️ **No previous progress found.** There is no output document to resume from. Please use **[C] Create** to start a fresh workflow run."
+
+**THEN:** Halt. Do not proceed.
+
+---
+
+### 2. Verify Previously Created Artifacts
+
+Since this is a file-creation workflow, verify that artifacts from completed steps still exist on disk:
+
+- If `step-02-generate-pipeline` is in `stepsCompleted`, check that the pipeline config file exists (e.g., `.github/workflows/test.yml` or equivalent)
+- If any expected artifact is missing, warn the user and suggest re-running from the step that creates it
+
+---
+
+### 3. Display Progress Dashboard
+
+Display:
+
+"📋 **Workflow Resume — CI/CD Pipeline Setup**
+
+**Last saved:** {lastSaved}
+**Steps completed:** {stepsCompleted.length} of 4
+
+1. Preflight Checks (step-01-preflight) — {✅ if in stepsCompleted, ⬜ otherwise}
+2. Generate Pipeline (step-02-generate-pipeline) — {✅ if in stepsCompleted, ⬜ otherwise}
+3. Configure Quality Gates (step-03-configure-quality-gates) — {✅ if in stepsCompleted, ⬜ otherwise}
+4. Validate & Summary (step-04-validate-and-summary) — {✅ if in stepsCompleted, ⬜ otherwise}"
+
+---
+
+### 4. Route to Next Step
+
+Based on `lastStep`, load the next incomplete step:
+
+- `'step-01-preflight'` → Load `./step-02-generate-pipeline.md`
+- `'step-02-generate-pipeline'` → Load `./step-03-configure-quality-gates.md`
+- `'step-03-configure-quality-gates'` → Load `./step-04-validate-and-summary.md`
+- `'step-04-validate-and-summary'` → **Workflow already complete.** Display: "✅ **All steps completed.** Use **[V] Validate** to review outputs or **[E] Edit** to make revisions." Then halt.
+
+**If `lastStep` does not match any value above**, display: "⚠️ **Unknown progress state** (`lastStep`: {lastStep}). Please use **[C] Create** to start fresh." Then halt.
+
+**Otherwise**, load the identified step file, read completely, and execute.
+
+The existing content in `{outputFile}` provides context from previously completed steps. Use it as reference for remaining steps.
+
+---
+
+## 🚨 SYSTEM SUCCESS/FAILURE METRICS
+
+### ✅ SUCCESS:
+
+- Output document loaded and parsed correctly
+- Previously created artifacts verified
+- Progress dashboard displayed accurately
+- Routed to correct next step
+
+### ❌ SYSTEM FAILURE:
+
+- Not loading output document
+- Incorrect progress display
+- Routing to wrong step
+- Re-executing completed steps
+
+**Master Rule:** Resume MUST route to the exact next incomplete step. Never re-execute completed steps.