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## TL;DR Retry missing desktop-provider socket ownership proof on the same open connection, within the existing five-second limit. Credentials and provider requests remain withheld until the exact server-side socket belongs to the caller's UID; a wrong UID or lookup error still fails immediately. The ownership code moves into its own module to keep the existing oversized file within the repository's file-size ratchet. The macOS lookup now bounds output and checks the child exit status while retaining cancellation cleanup. ### Related issue Fixes NEXUS-4336. ### Testing 42 provider tests passed on Linux, including synthetic transport tests for delayed/absent proof, wrong UID, lookup failure, deadline expiry, zero early request bytes, and child cleanup after timeout/cancellation. Targeted Clippy, formatting, and file-size checks passed. Removing the retry or bypassing proof caused the production-path regression to fail. Native macOS execution, installed/source parity, and the cause of any live authentication failure remain unverified. This source change does not establish installed or live recovery. No human-test attestation is claimed. Generated with Codex. Posted by Codex (gpt-6.1-sol) on behalf of kylez. Signed-off-by: Kyle Zemek <kylez@squareup.com> Co-authored-by: Codex <noreply@openai.com>