fix(httpapi): expose unavailable v2 session mutations (#28624)

packages/opencode/src/server/routes/instance/httpapi/groups/v2/session.ts

@@ -4,7 +4,7 @@ import { Prompt } from "@opencode-ai/core/session-prompt"
 import { SessionV2 } from "@/v2/session"
 import { Schema } from "effect"
 import { HttpApiEndpoint, HttpApiGroup, HttpApiSchema, OpenApi } from "effect/unstable/httpapi"
-import { InvalidCursorError, InvalidRequestError, SessionNotFoundError } from "../../errors"
+import { InvalidCursorError, InvalidRequestError, ServiceUnavailableError, SessionNotFoundError } from "../../errors"
 import { V2Authorization } from "../../middleware/authorization"
 import { WorkspaceRoutingQuery, WorkspaceRoutingQueryFields } from "../../middleware/workspace-routing"
 import { QueryBoolean } from "../query"
@@ -61,7 +61,7 @@ export const SessionGroup = HttpApiGroup.make("v2.session")
         delivery: SessionV2.Delivery.pipe(Schema.optional),
       }),
       success: SessionMessage.Message,
-      error: SessionNotFoundError,
+      error: [SessionNotFoundError, ServiceUnavailableError],
     }).annotateMerge(
       OpenApi.annotations({
         identifier: "v2.session.prompt",
@@ -75,7 +75,7 @@ export const SessionGroup = HttpApiGroup.make("v2.session")
       params: { sessionID: SessionID },
       query: WorkspaceRoutingQuery,
       success: HttpApiSchema.NoContent,
-      error: SessionNotFoundError,
+      error: [SessionNotFoundError, ServiceUnavailableError],
     }).annotateMerge(
       OpenApi.annotations({
         identifier: "v2.session.compact",
@@ -89,7 +89,7 @@ export const SessionGroup = HttpApiGroup.make("v2.session")
       params: { sessionID: SessionID },
       query: WorkspaceRoutingQuery,
       success: HttpApiSchema.NoContent,
-      error: SessionNotFoundError,
+      error: [SessionNotFoundError, ServiceUnavailableError],
     }).annotateMerge(
       OpenApi.annotations({
         identifier: "v2.session.wait",