feat: add SDK path for getMessageIds in context-window recovery

src/hooks/anthropic-context-window-limit-recovery/message-storage-directory.ts

@@ -1,8 +1,29 @@
 import { existsSync, readdirSync } from "node:fs"
+import type { PluginInput } from "@opencode-ai/plugin"
 import { getMessageDir } from "../../shared/opencode-message-dir"
 
 export { getMessageDir }
 
+type OpencodeClient = PluginInput["client"]
+
+interface SDKMessage {
+  info: { id: string }
+  parts: unknown[]
+}
+
+export async function getMessageIdsFromSDK(
+  client: OpencodeClient,
+  sessionID: string
+): Promise<string[]> {
+  try {
+    const response = await client.session.messages({ path: { id: sessionID } })
+    const messages = (response.data ?? []) as SDKMessage[]
+    return messages.map(msg => msg.info.id)
+  } catch {
+    return []
+  }
+}
+
 export function getMessageIds(sessionID: string): string[] {
   const messageDir = getMessageDir(sessionID)
   if (!messageDir || !existsSync(messageDir)) return []