Add Effect-native core event system (#27415)

packages/opencode/src/server/routes/instance/httpapi/handlers/v2.ts

@@ -1,12 +1,12 @@
 import { SessionV2 } from "@/v2/session"
 import { Layer } from "effect"
-import { layer as v2InstanceLayer } from "../groups/v2/instance"
+import { layer as v2LocationLayer } from "../groups/v2/location"
 import { messageHandlers } from "./v2/message"
 import { modelHandlers } from "./v2/model"
 import { providerHandlers } from "./v2/provider"
 import { sessionHandlers } from "./v2/session"
 
 export const v2Handlers = Layer.mergeAll(sessionHandlers, messageHandlers, modelHandlers, providerHandlers).pipe(
-  Layer.provide(v2InstanceLayer),
+  Layer.provide(v2LocationLayer),
   Layer.provide(SessionV2.defaultLayer),
 )

packages/opencode/src/server/routes/instance/httpapi/handlers/v2/message.ts

@@ -1,4 +1,4 @@
-import { SessionMessage } from "@/v2/session-message"
+import { SessionMessage } from "@opencode-ai/core/session-message"
 import { SessionV2 } from "@/v2/session"
 import { Effect, Schema } from "effect"
 import * as DateTime from "effect/DateTime"