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/message-builder.ts

@@ -64,7 +64,7 @@ async function findEmptyMessageIdsFromSDK(
     const response = (await client.session.messages({
       path: { id: sessionID },
     })) as { data?: SDKMessage[] }
-    const messages = response.data ?? []
+    const messages = ((response.data ?? response) as unknown as SDKMessage[]) ?? []
 
     const emptyIds: string[] = []
     for (const message of messages) {

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

@@ -17,7 +17,7 @@ export async function getMessageIdsFromSDK(
 ): Promise<string[]> {
   try {
     const response = await client.session.messages({ path: { id: sessionID } })
-    const messages = (response.data ?? []) as SDKMessage[]
+    const messages = ((response.data ?? response) as unknown as SDKMessage[]) ?? []
     return messages.map(msg => msg.info.id)
   } catch {
     return []

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 []

src/hooks/anthropic-context-window-limit-recovery/pruning-tool-output-truncation.ts

@@ -108,7 +108,7 @@ async function truncateToolOutputsByCallIdFromSDK(
 ): Promise<{ truncatedCount: number }> {
   try {
     const response = await client.session.messages({ path: { id: sessionID } })
-    const messages = (response.data ?? []) as SDKMessage[]
+    const messages = ((response.data ?? response) as unknown as SDKMessage[]) ?? []
     let truncatedCount = 0
 
     for (const msg of messages) {

src/hooks/anthropic-context-window-limit-recovery/target-token-truncation.ts

@@ -66,7 +66,7 @@ export async function truncateUntilTargetTokens(
 			const response = (await client.session.messages({
 				path: { id: sessionID },
 			})) as { data?: SDKMessage[] }
-			const messages = response.data ?? []
+			const messages = (response.data ?? response) as SDKMessage[]
 			toolPartsByKey = new Map<string, SDKToolPart>()
 
 			for (const message of messages) {

src/hooks/anthropic-context-window-limit-recovery/tool-result-storage-sdk.ts

@@ -32,7 +32,7 @@ export async function findToolResultsBySizeFromSDK(
 ): Promise<ToolResultInfo[]> {
   try {
     const response = await client.session.messages({ path: { id: sessionID } })
-    const messages = (response.data ?? []) as SDKMessage[]
+    const messages = ((response.data ?? response) as unknown as SDKMessage[]) ?? []
     const results: ToolResultInfo[] = []
 
     for (const msg of messages) {
@@ -98,7 +98,7 @@ export async function countTruncatedResultsFromSDK(
 ): Promise<number> {
   try {
     const response = await client.session.messages({ path: { id: sessionID } })
-    const messages = (response.data ?? []) as SDKMessage[]
+    const messages = ((response.data ?? response) as unknown as SDKMessage[]) ?? []
     let count = 0
 
     for (const msg of messages) {