fix: defensive SDK response handling & parts-reader normalization

- Replace all response.data ?? [] with (response.data ?? response)
  pattern across 14 files to handle SDK array-shaped responses
- Normalize SDK parts in parts-reader.ts by injecting sessionID/
  messageID before validation (P1: SDK parts lack these fields)
- Treat unknown part types as having content in
  recover-empty-content-message-sdk.ts to prevent false placeholder
  injection on image/file parts
- Replace local isRecord with shared import in parts-reader.ts

src/hooks/anthropic-context-window-limit-recovery/pruning-deduplication.ts

@@ -72,7 +72,7 @@ function readMessages(sessionID: string): MessagePart[] {
 async function readMessagesFromSDK(client: OpencodeClient, sessionID: string): Promise<MessagePart[]> {
   try {
     const response = await client.session.messages({ path: { id: sessionID } })
-    const rawMessages = (response.data ?? []) as Array<{ parts?: ToolPart[] }>
+    const rawMessages = ((response.data ?? response) as unknown as Array<{ parts?: ToolPart[] }>) ?? []
     return rawMessages.filter((m) => m.parts) as MessagePart[]
   } catch {
     return []