fix(anthropic-auto-compact): use OpenCode's official compaction mechanism and proper retry

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/hooks/anthropic-auto-compact/storage.ts

@@ -21,6 +21,11 @@ interface StoredToolPart {
     input: Record<string, unknown>
     output?: string
     error?: string
+    time?: {
+      start: number
+      end?: number
+      compacted?: number
+    }
   }
   truncated?: boolean
   originalSize?: number
@@ -124,6 +129,11 @@ export function truncateToolResult(partPath: string): {
     part.originalSize = originalSize
     part.state.output = TRUNCATION_MESSAGE
 
+    if (!part.state.time) {
+      part.state.time = { start: Date.now() }
+    }
+    part.state.time.compacted = Date.now()
+
     writeFileSync(partPath, JSON.stringify(part, null, 2))
 
     return { success: true, toolName, originalSize }