fix: deduplicate MemoryRelation type and align MemoryEntry with backend schema

- Remove duplicate MemoryRelation definition from types.ts, import from api-types.ts
- Add MemoryRelation to re-exports in types.ts and index.tsx
- Make MemoryEntry.memory required and content optional to match backend MemoryEntrySchema

packages/memory-graph/src/api-types.ts

@@ -2,8 +2,8 @@ export type MemoryRelation = "updates" | "extends" | "derives"
 
 export interface MemoryEntry {
 	id: string
-	content: string | null
-	memory?: string | null
+	memory: string
+	content?: string | null
 	createdAt: string
 	updatedAt: string
 	spaceId?: string | null

packages/memory-graph/src/index.tsx

@@ -35,4 +35,5 @@ export type {
 	DocumentWithMemories,
 	MemoryEntry,
 	DocumentsResponse,
+	MemoryRelation,
 } from "./api-types"

packages/memory-graph/src/types.ts

@@ -1,6 +1,6 @@
 // Graph API types matching backend response
 
-export type MemoryRelation = "updates" | "extends" | "derives"
+import type { MemoryRelation } from "./api-types"
 
 export interface GraphApiMemory {
 	id: string
@@ -221,4 +221,5 @@ export type {
 	DocumentWithMemories,
 	MemoryEntry,
 	DocumentsResponse,
+	MemoryRelation,
 } from "./api-types"