feat(diagnostic): Agent-Historie pro Agent — Akkordeon je Nachricht

Jede Host-Aktion wird als Historie-Eintrag festgehalten und in der Diagnostic
pro User-Nachricht gruppiert aufklappbar dargestellt (mit Screenshot-Thumbnails).

- Brain: trace_id+msg pro chat(); _dispatch_host als Wrapper um _dispatch_host_inner
  emittiert je Aktion einen Eintrag an POST /internal/agent-history (Datei-Pfad aus
  Screenshot-Text erkannt).
- Bridge: /internal/agent-history persistiert nach /shared/config/agent_history/
  <hostId>.jsonl (Ringpuffer 200) + broadcastet agent_history; agent_history_query
  -> agent_history_list.
- RVS: agent_history/_query/_list in ALLOWED_TYPES (sonst still verworfen).
- Diagnostic-Server: relay browser<->RVS + /uploads/<file> Bild-Endpoint (nur
  /shared/uploads, kein Traversal).
- index.html: 'Historie'-Button je Host, Modal mit Akkordeon (Gruppe=Nachricht,
  aufklappbar, Screenshot-Thumbs), Live-Refresh bei agent_history.

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

aria-brain/agent.py

@@ -2200,6 +2200,11 @@ class Agent:
         # Events vom letzten Turn weglassen
         self._pending_events = []
 
+        # Trace fuer die Agent-Historie (Diagnostic gruppiert Host-Aktionen pro
+        # dieser einen User-Nachricht). Best-effort, nur Anzeige.
+        self._trace_id = os.urandom(6).hex()
+        self._trace_msg = user_message[:160]
+
         # Projekt-Kontext pro Request statt aus globalem State
         active_project_id = (project_id or "").strip()
         active_project = projects_mod.get_project(active_project_id) if active_project_id else None
@@ -2658,8 +2663,49 @@ class Agent:
             return f"FEHLER: Satellit/Bridge nicht erreichbar: {exc}"
 
     def _dispatch_host(self, name: str, arguments: dict) -> str:
+        """Wrapper um _dispatch_host_inner: fuehrt die Host-Aktion aus und schreibt
+        danach einen Historie-Eintrag an die Bridge (fuer die Diagnostic-Ansicht
+        'was wurde pro Nachricht auf diesem Agent gemacht')."""
+        text = self._dispatch_host_inner(name, arguments)
+        try:
+            self._emit_agent_history(name, arguments, text)
+        except Exception:
+            pass
+        return text
+
+    def _emit_agent_history(self, name: str, arguments: dict, text: str) -> None:
+        """Best-effort: ein Historie-Eintrag pro Host-Aktion an die Bridge."""
+        if name == "host_list":
+            return
+        host = (arguments.get("host") or "").strip()
+        if not host:
+            return
+        ok = not text.lstrip().upper().startswith("FEHLER")
+        m = re.search(r"/shared/uploads/\S+?\.(?:png|jpg|jpeg|webp)", text)
+        body = {
+            "host": host,
+            "trace_id": getattr(self, "_trace_id", ""),
+            "msg": getattr(self, "_trace_msg", ""),
+            "tool": name,
+            "action": name[len("host_"):] if name.startswith("host_") else name,
+            "args": {k: v for k, v in arguments.items() if k != "host"},
+            "ok": ok,
+            "summary": (text.strip().splitlines()[0] if text.strip() else "")[:200],
+            "file": m.group(0) if m else None,
+            "ts": int(time.time() * 1000),
+        }
+        try:
+            data = json.dumps(body).encode("utf-8")
+            req = urllib.request.Request(f"{BRIDGE_URL}/internal/agent-history",
+                                         data=data, method="POST",
+                                         headers={"Content-Type": "application/json"})
+            urllib.request.urlopen(req, timeout=5).close()
+        except Exception:
+            pass
+
+    def _dispatch_host_inner(self, name: str, arguments: dict) -> str:
         """host_list / host_exec / host_read / host_write / host_info /
-        host_screenshot — via Bridge (/internal/host*) → RVS → Host-Agent."""
+        host_screenshot / host_ui_* — via Bridge (/internal/host*) → RVS → Host-Agent."""
         import base64 as _b64
 
         def _post(path: str, body: dict, timeout: float) -> dict: