`info.hooks` is self-reported by the sandboxed bundle, and the loader
registered any recognised hook name without checking permissions. An
untrusted, null-origin plugin could therefore claim `onRenderEmailBody`
and replace the rendered body of any opened email without ever holding
`email:render-takeover` — the permission was enforced only by the
one-time consent dialog, i.e. it gated what the user was *asked*, not
what the host *allowed*.
Add HOOK_PERMISSIONS covering the hooks that can read message content,
alter outgoing mail, or observe key state: render takeover, the three
send-interception hooks, bulk-content hooks, attachment upload, and the
four S/MIME hooks. Hooks absent from the map stay unrestricted (UI
observation, toasts, navigation), so ordinary plugins are unaffected.
Refused hooks fail closed and log the missing permission by name — a
silently inert hook is far harder to diagnose than a refused one.
Export hasPermission() from host-api rather than reimplementing the rule
in the loader, so the hook gate and the RPC gate cannot drift apart.
Remaining ~200 hooks are tracked as B-09.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
