Restore and Incident Record

Record: intended artifact and exact lines; original/backup/restored paths; predicted result; actual restored content; incomplete-control result; one diagnosis hypothesis and check; rollback; untested failure modes; assistance; repair. Keep original and changed copies distinguishable. Finish the guided lab before the fresh assessment. File-manager and editor workflows are valid; command-line use is optional.

Continue with the guided lab. Consult calibration only after preserving an attempt.