fix: skip startup toasts in CLI run mode for auto-update-checker

Add OPENCODE_CLI_RUN_MODE environment variable check to skip all startup
toasts and version checks when running in CLI mode. This prevents
notification spam during automated CLI run sessions.

Includes comprehensive test coverage for CLI run mode behavior.

🤖 Generated with OhMyOpenCode assistance

src/hooks/auto-update-checker/hook.ts

@@ -10,6 +10,7 @@ import { showLocalDevToast, showVersionToast } from "./hook/startup-toasts"
 
 export function createAutoUpdateCheckerHook(ctx: PluginInput, options: AutoUpdateCheckerOptions = {}) {
   const { showStartupToast = true, isSisyphusEnabled = false, autoUpdate = true } = options
+  const isCliRunMode = process.env.OPENCODE_CLI_RUN_MODE === "true"
 
   const getToastMessage = (isUpdate: boolean, latestVersion?: string): string => {
     if (isSisyphusEnabled) {
@@ -27,6 +28,7 @@ export function createAutoUpdateCheckerHook(ctx: PluginInput, options: AutoUpdat
   return {
     event: ({ event }: { event: { type: string; properties?: unknown } }) => {
       if (event.type !== "session.created") return
+      if (isCliRunMode) return
       if (hasChecked) return
 
       const props = event.properties as { info?: { parentID?: string } } | undefined