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/exploration/case_prompt.py

@@ -0,0 +1,22 @@
+"""Executable case prompts shared by synthesis, single reruns and batches."""
+
+import re
+
+
+def case_prompt(case: dict) -> str:
+    prefix = f"前置条件：\n{case['preconditions']}\n\n" if case.get("preconditions") else ""
+    return prefix + case["goal"]
+
+
+def require_resolved_case(case: dict) -> str:
+    """Drafts may contain parameters, but execution has no template substitution."""
+    prompt = case_prompt(case)
+    variables = list(dict.fromkeys(re.findall(r"\$\{[^{}\r\n]+\}", prompt)))
+    if variables:
+        raise ValueError(
+            "用例仍有未填写参数："
+            + "、".join(variables)
+            + "。请在「查看 / 编辑」中填写实际值并保存新版本，或点击「重新提炼」；"
+            "复跑和批次不会自动替换参数。未指定报告位置时可使用本次任务 trace。"
+        )
+    return prompt