feat(skills): 5 méthodes expertes auto-injectées (routeur lexical)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/tests/test_skills.py

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+import os
+import tempfile
+
+os.environ.setdefault("DATA_DIR", tempfile.mkdtemp())
+os.environ.setdefault("WORKSPACE_DIR", tempfile.mkdtemp())
+
+from app import skills  # noqa: E402
+
+
+def test_five_skills_loaded():
+    assert len(skills.ALL_SKILLS) == 5
+    assert all(s["title"] and s["body"] for s in skills.ALL_SKILLS.values())
+
+
+def test_bug_message_picks_debug():
+    s = skills.pick_skill("mon script plante avec une erreur TypeError au démarrage")
+    assert s and s["name"] == "debogage-systematique"
+
+
+def test_web_message_picks_web():
+    s = skills.pick_skill("crée une page html responsive pour ma boutique")
+    assert s and s["name"] == "creation-web"
+
+
+def test_banal_message_picks_nothing():
+    assert skills.pick_skill("bonjour, quelle heure est-il ?") is None