Submit initial OpenCode 2.0.12 prompts through the native startup plugin (#25428)

* fix(opencode): submit initial prompts for reviewed 2.0.12

Route the reported release through the existing native startup intent.
Retain conservative behavior for other unreviewed versions.

* Wait for OpenCode startup fixture file reads in the hydration test

---------

Co-authored-by: nwparker <nwparker@users.noreply.github.com>

src/shared/opencode-cli-version.ts

@@ -1,5 +1,7 @@
 import { isValidAppVersion } from './app-version'
 
+export const OPENCODE_NATIVE_PROMPT_VERSIONS = ['2.0.12', '2.0.16'] as const
+
 export type OpenCodeCliCapabilities = {
   version: string | null
   pluginApi: 'v1' | 'v2' | 'unknown'
@@ -21,6 +23,11 @@ export function getOpenCodeCliCapabilities(
   return {
     version,
     pluginApi: major === '1' ? 'v1' : major === '2' ? 'v2' : 'unknown',
-    promptMode: major === '1' ? 'submit' : version === '2.0.16' ? 'prefill' : 'unknown'
+    promptMode:
+      major === '1'
+        ? 'submit'
+        : OPENCODE_NATIVE_PROMPT_VERSIONS.some((supported) => supported === version)
+          ? 'prefill'
+          : 'unknown'
   }
 }