feat: add auth extension points and one ssh connect pipeline

plugins/automations/src/backend/index.ts

@@ -1,4 +1,5 @@
 import type { PluginContext } from "@termix/plugin-sdk/backend";
+import { setPluginSsh } from "./ssh.js";
 import { startAutomationsService, stopAutomationsService } from "./routes.js";
 import {
   startAutomationScheduler,
@@ -6,6 +7,8 @@ import {
 } from "./scheduler.js";
 
 export async function activate(ctx: PluginContext) {
+  setPluginSsh(ctx.ssh);
+  ctx.disposables.add(() => setPluginSsh(null));
   startAutomationsService(
     // The webhook route authenticates on its own per-automation token rather
     // than a session, which is the point of an inbound webhook.