Replace pathname writes with the shared configuration publication owner.
Reject replacement readback and restore through the exact staged descriptor.
Retain initial-read, readback and publication cleanup owners for retry. Share
nested cleanup handling with setup without granting authority to opaque
cancellation reasons. Separate host admission from nested file cleanup gates.
Preserve uninstall file modes, including readable read-only configurations.
Hold the exact staging permission owner through writable-descriptor handoff
and failed mode restoration. Remove the superseded writeText effect contract.
Validation: 206 focused tests across 9 files, check:fast, formatting and
docs:check passed. Three uninstall replacement controls fail on baseline
7e4eed9dd while thirteen setup controls pass. Twelve completed CLI uninstall
tasks preserve equivalent outputs, config, backups and modes0400/0640.
Two read-only source reviews completed. Native Windows/Linux and real editor
races remain unverified; in-place writer exclusion is still not provided.
Closes#4902
morluto
2fb5e204a3