feat(core): add project-level memory scope to save_memory tool (#24161)

packages/core/src/utils/memoryDiscovery.ts

@@ -485,6 +485,30 @@ export async function getGlobalMemoryPaths(): Promise<string[]> {
   );
 }
 
+export async function getUserProjectMemoryPaths(
+  projectMemoryDir: string,
+): Promise<string[]> {
+  const geminiMdFilenames = getAllGeminiMdFilenames();
+
+  const accessChecks = geminiMdFilenames.map(async (filename) => {
+    const memoryPath = normalizePath(path.join(projectMemoryDir, filename));
+    try {
+      await fs.access(memoryPath, fsSync.constants.R_OK);
+      debugLogger.debug(
+        '[DEBUG] [MemoryDiscovery] Found user project memory file:',
+        memoryPath,
+      );
+      return memoryPath;
+    } catch {
+      return null;
+    }
+  });
+
+  return (await Promise.all(accessChecks)).filter(
+    (p): p is string => p !== null,
+  );
+}
+
 export function getExtensionMemoryPaths(
   extensionLoader: ExtensionLoader,
 ): string[] {
@@ -526,7 +550,12 @@ export async function getEnvironmentMemoryPaths(
 }
 
 export function categorizeAndConcatenate(
-  paths: { global: string[]; extension: string[]; project: string[] },
+  paths: {
+    global: string[];
+    extension: string[];
+    project: string[];
+    userProjectMemory?: string[];
+  },
   contentsMap: Map<string, GeminiFileContent>,
 ): HierarchicalMemory {
   const getConcatenated = (pList: string[]) =>
@@ -540,6 +569,7 @@ export function categorizeAndConcatenate(
     global: getConcatenated(paths.global),
     extension: getConcatenated(paths.extension),
     project: getConcatenated(paths.project),
+    userProjectMemory: getConcatenated(paths.userProjectMemory ?? []),
   };
 }