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TREK's four channels (in-app, email, webhook, ntfy) were a closed set: notificationService.send() dispatched with four copy-pasted `if` blocks and no provider abstraction, so a fifth channel meant editing eight files by hand. A plugin could produce a notification via ctx.notify.send(), but never deliver one. A plugin now registers a channel with `hooks.notificationChannel` + `hook:notification-channel` on a plain `type: 'integration'` — not a new manifest type, so the TREK-Plugins registry schema and both its CI gates are untouched. Core refactor - New channel registry (services/notifications/): email/webhook/ntfy become ExternalChannel providers wrapping the EXISTING send functions — no delivery logic is rewritten, only relocated. In-app deliberately stays out: it writes typed rows with scope/target/callbacks, not a rendered title+body, the same line shared/ already draws with i18n/externalNotifications. - The event text is now rendered once per recipient instead of once per channel. - The channel set is open: NotifChannel becomes a string, the matrix is registry-derived, and the UI columns are server-driven. The DB column was already bare TEXT and the Zod contract already a string record — only the TypeScript and the two UIs were ever closed. The hook runs USERLESS. Every other hook is user-initiated, so actingUserId falls out of the request; a notification is host-initiated for an ARBITRARY recipient, so ctx.settings.get() would return undefined. The host resolves the recipient's decrypted scope:'user' settings itself and passes them as an argument. That is what lets a channel plugin be handed someone's push token WITHOUT being handed the right to read their trips as them. Enabling the plugin is the opt-in: a plugin channel is not gated on the admin's `notification_channels` list. A built-in always exists in code and needs an explicit switch; a plugin channel only exists because an admin enabled that plugin. (Nothing could write a `plugin:` id into that CSV anyway, and the admin toggle rebuilt it from three booleans, silently dropping anything else — so requiring a second opt-in meant the channel could never be turned on at all.) Also fixed, found while building this: - Plugin settings keys were unvalidated, so a field named `__proto__` or `constructor` resolved off Object.prototype: a REQUIRED field with such a name reported as configured for every user who had configured nothing — enough, for a channel, to be dispatched to everyone with no credentials. Keys are now constrained at install and the config blob is parsed null-prototype, so it is impossible even for an already-installed plugin. - A `select` field's options were cast straight through, so the obvious `["1","5"]` form rendered every dropdown entry BLANK (the client reads value/label). Now coerced, and malformed options are rejected. Also adds: operator-supplied egress hosts (a plugin talking to a self-hosted service can't name the operator's host at publish time, so an admin adds it post-install and the runtime re-spawns the child with the widened allow-list — only for a plugin that DECLARED operatorEgress, and only an admin, never a user); settings-page actions (a "Test connection" button, user-initiated so ctx.settings.get() returns the clicking user's own value); and a Gotify-shaped notification-channel template in the SDK. Verified end to end against a real Gotify container, not just in tests.