fix(ssh): keep draining tunnel diagnostics after readiness (#18832)

Co-authored-by: SAPHID <saphid@users.noreply.github.com>
Co-authored-by: GPT-6.1 Sol <noreply@openai.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
a331655b74Alex Southwell committed on 10/18/2026, 7:21:54 PM· committed by GitHubparenta917d84
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