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.

tests/unit/test_exploration_synthesis.py

@@ -82,6 +82,50 @@ async def test_generation_is_idempotent_and_preserves_rerun_independence(synthes
     model.with_structured_output.return_value.ainvoke.assert_awaited_once()
 
 
+@pytest.mark.asyncio
+async def test_synthesis_repairs_unbound_parameters_once_with_original_evidence(synthesis):
+    repository, session, run, model = synthesis
+    invoke = model.with_structured_output.return_value.ainvoke
+    invoke.side_effect = [
+        CaseDraft(name="错误草稿", goal="访问 ${首页URL}", preconditions="已指定 ${报告位置}"),
+        CaseDraft(name="修订", goal="核对设置，报告保存在本次任务 trace。", evidence=["步骤3"]),
+    ]
+    result = await generate_case(
+        repository, session["id"], "generate", run["id"], 0, ctx=SimpleNamespace(task_control=None)
+    )
+    assert result["version"] == 1 and "${" not in result["goal"]
+    assert invoke.await_count == 2
+    messages = invoke.await_args.args[0]
+    assert "不生成 ${名称}" in messages[0].content
+    assert "用户明确指定的位置必须保留" in messages[0].content
+    assert "不要让一次复跑递归地产生下一份复跑用例" in messages[0].content
+    assert "保留该业务验收" in messages[0].content
+    assert "设置开启" in messages[1].content
+    assert "不得猜测未知业务输入或降低验收标准" in messages[-1].content
+
+
+@pytest.mark.asyncio
+async def test_failed_parameter_repair_never_saves_unexecutable_generated_case(synthesis):
+    repository, session, run, model = synthesis
+    repository.save_case(session["id"], CaseDraft(name="原用例", goal="核对设置"), 0, "save")
+    invoke = model.with_structured_output.return_value.ainvoke
+    invoke.return_value = CaseDraft(name="错误", goal="保存到 ${报告位置}")
+    with pytest.raises(ValueError, match="未填写参数"):
+        await generate_case(
+            repository,
+            session["id"],
+            "generate",
+            run["id"],
+            1,
+            ctx=SimpleNamespace(task_control=None),
+        )
+    assert invoke.await_count == 2
+    assert repository.case(session["id"])["version"] == 1
+    assert repository.case(session["id"])["name"] == "原用例"
+    assert repository.database.records("exploration_generation")[0]["status"] == "failed"
+    assert repository.run(run["id"])["outcome"]["test_result"]["status"] == "passed"
+
+
 @pytest.mark.asyncio
 async def test_model_generation_cannot_overwrite_a_concurrent_manual_revision(synthesis):
     repository, session, run, model = synthesis