feat: add official Codex skill and harden task execution

Install and update artemis-use with task diagnostics and plugin guidance. Preserve cross-device file receipts, review canonical reports, guard stage transitions and reduce small history summaries. Improve exploration lifecycle, request recovery and browser live connections.

apps/admin_console/database/repositories/session_repository.py

@@ -320,6 +320,7 @@ class SessionRepository:
                 return 0
 
         llm_calls = prompt = completion = total = cached = 0
+        by_node_model: dict[tuple[str, str], dict] = {}
         operator_context: int | None = None
         operator_context_at: float | None = None
         with db_session(self.db_path) as conn:
@@ -348,6 +349,27 @@ class SessionRepository:
                 total += t
                 cached += _int(payload.get("cached_tokens"))
                 node = str(payload.get("node") or "").strip().lower()
+                model_name = str(payload.get("model") or "unknown")
+                group = by_node_model.setdefault(
+                    (node, model_name),
+                    {
+                        "node": node,
+                        "model": model_name,
+                        "llm_calls": 0,
+                        "prompt_tokens": 0,
+                        "completion_tokens": 0,
+                        "cached_tokens": 0,
+                    },
+                )
+                group["llm_calls"] += 1
+                group["prompt_tokens"] += p
+                group["completion_tokens"] += c
+                group["cached_tokens"] += _int(payload.get("cached_tokens"))
+                group["cache_hit_rate"] = (
+                    group["cached_tokens"] / group["prompt_tokens"]
+                    if group["prompt_tokens"]
+                    else None
+                )
                 if node in OPERATOR_NODE_NAMES:
                     operator_context = _int(payload.get("context_base_tokens")) or p
                     operator_context_at = row["timestamp"]
@@ -375,6 +397,7 @@ class SessionRepository:
             "completion_tokens": completion,
             "total_tokens": total,
             "cached_tokens": cached,
+            "by_node_model": list(by_node_model.values()),
             "operator_context_tokens": operator_context,
             "operator_context_window_tokens": OPERATOR_CONTEXT_WINDOW_TOKENS,
             "operator_context_updated_at": operator_context_at,