refactor: consolidate duplicated Promise.all dual reads into resolveMessageContext utility

src/tools/background-task/create-background-task.ts

@@ -2,18 +2,12 @@ import { tool, type PluginInput, type ToolDefinition } from "@opencode-ai/plugin
 import type { BackgroundManager } from "../../features/background-agent"
 import type { BackgroundTaskArgs } from "./types"
 import { BACKGROUND_TASK_DESCRIPTION } from "./constants"
-import {
-  findFirstMessageWithAgent,
-  findFirstMessageWithAgentFromSDK,
-  findNearestMessageWithFields,
-  findNearestMessageWithFieldsFromSDK,
-} from "../../features/hook-message-injector"
+import { resolveMessageContext } from "../../features/hook-message-injector"
 import { getSessionAgent } from "../../features/claude-code-session-state"
 import { storeToolMetadata } from "../../features/tool-metadata-store"
 import { log } from "../../shared/logger"
 import { delay } from "./delay"
 import { getMessageDir } from "./message-dir"
-import { isSqliteBackend } from "../../shared/opencode-storage-detection"
 
 type ToolContextWithMetadata = {
   sessionID: string
@@ -44,16 +38,11 @@ export function createBackgroundTask(
 
       try {
         const messageDir = getMessageDir(ctx.sessionID)
-
-        const [prevMessage, firstMessageAgent] = isSqliteBackend()
-          ? await Promise.all([
-              findNearestMessageWithFieldsFromSDK(client, ctx.sessionID),
-              findFirstMessageWithAgentFromSDK(client, ctx.sessionID),
-            ])
-          : [
-              messageDir ? findNearestMessageWithFields(messageDir) : null,
-              messageDir ? findFirstMessageWithAgent(messageDir) : null,
-            ]
+        const { prevMessage, firstMessageAgent } = await resolveMessageContext(
+          ctx.sessionID,
+          client,
+          messageDir
+        )
 
         const sessionAgent = getSessionAgent(ctx.sessionID)
         const parentAgent = ctx.agent ?? sessionAgent ?? firstMessageAgent ?? prevMessage?.agent