Desktop plugins can toast in-app (host.notify) but have no sanctioned way to
reach the OS notification pipeline the app's own approval/turn alerts use, so
a plugin surfacing a genuinely notable background event (e.g. a discovery
plugin finding a match) stays invisible once the user steps away from Hermes.
Add a curated per-plugin door instead of exporting the raw dispatcher:
- ctx.notifyNative({ title, body?, silent? }) on PluginContext — attributed
to the plugin id, routed through dispatchNativeNotification so every
existing gate applies (master + per-kind prefs, post-connect baseline,
away-from-app gating, throttle).
- New 'plugin' native-notification kind with its own Settings ▸ Notifications
toggle (default on), so users silence plugins without losing app alerts.
- New optional `tag` discriminator on the notify payload keys the renderer
throttle and main-process cross-window dedupe per plugin, so two plugins
can't collapse each other's session-less notifications.
Consumer: the Index Network desktop plugin wants background opportunity
alerts; anything in ~/.hermes/desktop-plugins gets the same door.
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