ensure_aiohttp flattened every PM failure into the non-retryable
whatsapp_aiohttp_missing. That covered PM's post-install
"sms installed; restart Hermes to activate it" (sync succeeded, process
could not adopt the generation), a busy dependency lock and a failed
download. With WhatsApp as the only platform the gateway exited 78 and
systemd's RestartPreventExitStatus=78 kept it down.
ensure_aiohttp now returns (why, retryable). Final only when PM can never
install here (lazy installs disabled, or a foreign interpreter not on the
install's selected or older generation), when aiohttp is present but
broken, or when it is still absent after a successful install. A plain
shadowing aiohttp.py (no __path__) is reported as an incomplete install
instead of escaping as AttributeError.
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