fix: quoter les dates last_updated du frontmatter (le type date YAML casse les runtimes qui sérialisent en JSON)

Author: Rodkillah

comptable/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: comptable
 metadata:
-  last_updated: 2026-04-18
+  last_updated: "2026-04-18"
 includes:
   - data/**
   - scripts/**

controleur-fiscal/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: controleur-fiscal
 metadata:
-  last_updated: 2026-03-23
+  last_updated: "2026-03-23"
 includes:
   - data/**
   - company.example.json

fiscaliste/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: fiscaliste
 metadata:
-  last_updated: 2026-05-30
+  last_updated: "2026-05-30"
 includes:
   - data/**
   - references/**

notaire/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: notaire
 metadata:
-  last_updated: 2026-03-24
+  last_updated: "2026-03-24"
 includes:
   - scripts/fetch_notaire_data.py
   - scripts/test_fetch_notaire_data.py