chore: bump version to v0.4.9

Les 6 AbsencePolicy par défaut (barème Syntec / IDCC 1486) n'étaient
créées que par les fixtures, jamais en prod : l'écran « Politiques
d'absence » était vide en production.

Ajoute une migration de données idempotente (INSERT ... ON CONFLICT
(type) DO NOTHING sur l'index unique uniq_absence_policy_type) qui sème
les mêmes valeurs que les fixtures. Sans effet en dev (lignes déjà
présentes), peuple la prod au déploiement.

config/version.yaml

@@ -1,2 +1,2 @@
 parameters:
-    app.version: '0.4.7'
+    app.version: '0.4.9'

migrations/Version20260526100000.php

@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Seed the default absence policies (Syntec / IDCC 1486 legal baseline).
+ *
+ * These rows were previously created only by AppFixtures, so they existed in
+ * dev but never in production: the "Politiques d'absence" admin screen was
+ * empty in prod. This data migration seeds the same 6 policies idempotently
+ * (ON CONFLICT on the unique `type` index), so prod gets populated and dev,
+ * where fixtures already created them, is left untouched.
+ *
+ * Values mirror AppFixtures and the legal compliance design
+ * (docs/superpowers/specs/2026-05-22-absence-legal-compliance-fixes-design.md):
+ *   - CP: 25 jours ouvrés/an, préavis 30 j, pas de justificatif.
+ *   - Mariage/PACS: 4 j/événement ; Naissance: 3 j/événement.
+ *   - Décès / Congé parental / Maladie: pas de forfait codé en dur
+ *     (montant selon lien de parenté ou suspension), justificatif requis.
+ */
+final class Version20260526100000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Seed default absence policies (Syntec IDCC 1486) idempotently for prod';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // [type, days_per_year, days_per_event, justification_required, notice_days, count_working_days_only]
+        $policies = [
+            ['cp', '25', null, 'false', 30, 'true'],
+            ['mariage_pacs', null, '4', 'true', 0, 'true'],
+            ['naissance', null, '3', 'true', 0, 'true'],
+            ['conge_parental', null, null, 'true', 30, 'true'],
+            ['deces', null, null, 'true', 0, 'true'],
+            ['maladie', null, null, 'true', 0, 'true'],
+        ];
+
+        foreach ($policies as [$type, $daysPerYear, $daysPerEvent, $justif, $notice, $workingOnly]) {
+            $daysPerYear  = null === $daysPerYear ? 'NULL' : $daysPerYear;
+            $daysPerEvent = null === $daysPerEvent ? 'NULL' : $daysPerEvent;
+
+            $this->addSql(<<<SQL
+                INSERT INTO absence_policy
+                    (type, days_per_year, days_per_event, justification_required, notice_days, count_working_days_only, active)
+                VALUES
+                    ('{$type}', {$daysPerYear}, {$daysPerEvent}, {$justif}, {$notice}, {$workingOnly}, true)
+                ON CONFLICT (type) DO NOTHING
+                SQL);
+        }
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql("DELETE FROM absence_policy WHERE type IN ('cp', 'mariage_pacs', 'naissance', 'conge_parental', 'deces', 'maladie')");
+    }
+}