feat: replay E2E fonctionnel — 25/25 actions, 0 retries, SomEngine via serveur

Validé sur PC Windows (DESKTOP-58D5CAC, 2560x1600) :
- 8 clics résolus visuellement (1 anchor_template, 1 som_text_match, 6 som_vlm)
- Score moyen 0.75, temps moyen 1.6s
- Texte tapé correctement (bonjour, test word, date, email)
- 0 retries, 2 actions non vérifiées (OK)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

data/training/sessions/test_session_20260106_015945/test_session_20260106_015945.json

@@ -0,0 +1,50 @@
+{
+  "schema_version": "rawsession_v1",
+  "session_id": "test_session_20260106_015945",
+  "agent_version": "0.1.0",
+  "environment": {
+    "platform": "linux",
+    "hostname": "test-machine",
+    "screen": {
+      "primary_resolution": [
+        1920,
+        1080
+      ],
+      "display_scale": 1.0
+    }
+  },
+  "user": {
+    "id": "test_user",
+    "label": "Test User"
+  },
+  "context": {
+    "customer": "Test Customer",
+    "training_label": "Upload_Test",
+    "notes": "Real functionality test for upload without auth"
+  },
+  "started_at": "2026-01-06T01:59:45.468460Z",
+  "ended_at": "2026-01-06T01:59:45.468465Z",
+  "events": [
+    {
+      "t": 0.5,
+      "type": "mouse_click",
+      "button": "left",
+      "pos": [
+        450,
+        320
+      ],
+      "window": {
+        "title": "Test Application",
+        "app_name": "test_app"
+      },
+      "screenshot_id": "shot_0001"
+    }
+  ],
+  "screenshots": [
+    {
+      "screenshot_id": "shot_0001",
+      "relative_path": "shots/shot_0001.png",
+      "captured_at": "2026-01-06T01:59:45.468466Z"
+    }
+  ]
+}