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Replace configuration-specific write-file-atomic delegation with a verified input snapshot, exclusive private staging, and an explicit canonical-parent destination. Existing files publish by rename; first-run files use an exclusive link so a newly created destination is retained. Both consumers read back the publication owner's selected path. Retain descriptor and staging cleanup capabilities through recovery and host retry. Preserve mode and ownership, remove temporary permission handoffs, and use positional restoration writes. Keep UTF-8 diagnostics with failed cleanup. Validation: 284 focused tests passed, one skipped across 14 files; check:fast, format:check, docs:check (including five consistency tests), two source reviews, and 12 completed isolated public CLI setup/uninstall cost controls passed. Native Windows/Linux, real editor concurrency, and providers were not verified. Final-check/publication races and same-inode concurrent writers remain unexcluded. Fixes #4904