fix: improve plugin system robustness — agent/command resolution, async errors, hook timing, two-phase init (#18280)

Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>

packages/opencode/src/server/routes/session.ts

@@ -19,6 +19,8 @@ import { PermissionID } from "@/permission/schema"
 import { ModelID, ProviderID } from "@/provider/schema"
 import { errors } from "../error"
 import { lazy } from "../../util/lazy"
+import { Bus } from "../../bus"
+import { NamedError } from "@opencode-ai/util/error"
 
 const log = Log.create({ service: "server" })
 
@@ -846,7 +848,13 @@ export const SessionRoutes = lazy(() =>
         return stream(c, async () => {
           const sessionID = c.req.valid("param").sessionID
           const body = c.req.valid("json")
-          SessionPrompt.prompt({ ...body, sessionID })
+          SessionPrompt.prompt({ ...body, sessionID }).catch((err) => {
+            log.error("prompt_async failed", { sessionID, error: err })
+            Bus.publish(Session.Event.Error, {
+              sessionID,
+              error: new NamedError.Unknown({ message: err instanceof Error ? err.message : String(err) }).toObject(),
+            })
+          })
         })
       },
     )