Gemini 2.5 Pro encounters file permissions error on Ch1574 — switching to CLI

Gemini 2.5 Pro reported a "persistent and unusual file permissions error" while attempting to save the corrected Chapter 1574 via GUI. The GUI was described as "unreliable," prompting a switch to command-line verification. This is the second infrastructure issue affecting the Ch1574 re-drop — first the empty file (application-level defect), now a file permissions error (infrastructure-level). The dual failure mode suggests deeper filesystem or repository configuration issues on Gemini 2.5 Pro's environment.