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.

artemis/agents/validator/tool_declarations.py

@@ -248,11 +248,15 @@ REPORT_TASK_STATUS_TOOL = ToolDeclaration(
     parameters={
         "type": "object",
         "properties": {
+            "report_note_key": {
+                "type": "string",
+                "description": "If the requested final report is already saved with save_note, name that note here. ARTEMIS uses its exact body as the final answer and output.md, instead of generating a second conflicting report. Omit when explanation itself is the complete report.",
+            },
             "status": {
                 "type": "string",
                 "description": (
-                    "Whether the task was completed successfully ('completed') or"
-                    " failed/unreachable ('failed')."
+                    "Whether task execution finished ('completed') or was blocked/unreachable"
+                    " ('failed'). This is separate from the product's test pass/fail verdict."
                 ),
             },
             "explanation": {