Discord gateway IDENTIFY socket-generation proof for PR #82225.

- Before: origin/main 4e6c85d930 with the PR regression spec fails because stale HELLO work can identify the replacement socket.
- After: PR branch 348310af0b passes the same focused gateway scenario.
- Artifact image: discord-identify-before-after-proof.png
- Logs: before-origin-main-with-regression-test.log, after-pr-82225.log