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/utils/test_notes.py

@@ -17,11 +17,34 @@ from artemis.utils.notes import (
     list_notes_info,
     read_note_content,
     save_note_content,
+    save_verified_note,
     update_note_content,
 )
 import pytest
 
 
+@pytest.mark.parametrize("content", ["# 报告\n结果\n", "line\r\nsecond", ""])
+def test_verified_note_receipt_matches_actual_file_bytes(tmp_path, content):
+    import hashlib
+
+    receipt = save_verified_note(tmp_path, "report.md", content)
+    data = (tmp_path / receipt["path"]).read_bytes()
+    assert receipt["path"] == "notes/report.md"
+    assert receipt["verified"] is True and receipt["bytes"] == len(data)
+    assert receipt["sha256"] == hashlib.sha256(data).hexdigest()
+
+
+def test_verified_note_does_not_confirm_incomplete_write(tmp_path, monkeypatch):
+    from artemis.utils import notes
+
+    def partial_write(base_dir, key, content):
+        save_note_content(base_dir, key, content[:1])
+
+    monkeypatch.setattr(notes, "save_note_content", partial_write)
+    with pytest.raises(OSError, match="读回不一致"):
+        save_verified_note(tmp_path, "report", "完整报告")
+
+
 def test_list_notes_info(tmp_path):
     base_dir = tmp_path