[Desktop] Auto-updater reliability on slow/flaky GitHub download connections

[Dexploarer]

Source: docs/apps/desktop/user-feedback-2026-03-08.md ("GitHub download speed and reliability are becoming a recurring tester complaint").

Goal

Evaluate resume/retry/backoff behavior of the Electrobun auto-updater against flaky connections. Consider CDN mirroring or progress transparency.

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Auto-filed from sprint plan by Claude on 2026-04-10. See sprint-plan-2026-W16-desktop-stability.md and sprint-plan-2026-W16-runtime-parallel.md in repo root for full context.

[lalalune]

Closing — vague auto-updater reliability goal with no owner, no checklist, no concrete scope.