Third launch failure this session (after two 顺心 load-timeouts and a 中通 ERR_NAME_NOT_RESOLVED) — each a transient network blip that killed the whole worker because launch_and_prepare opened sites with no retry. Wrap each site open+goto in _open_page: up to 3 attempts (2s apart) on domcontentloaded, so transient DNS/timeout is absorbed; only persistent failure (all 3) aborts. All 5 sites + 安能 now launch clean.
Co-Authored-By: Claude <noreply@anthropic.com>
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