fix(hooks): address CodeRabbit review nits

- _project.ts: use cwd?.trim() || process.cwd() so a whitespace-only
  cwd doesn't pass through and produce a basename like "  /path  ".
- notification.ts: runtime-guard data.cwd with typeof === "string"
  before passing to resolveProject; data is parsed from untyped JSON.
- hook-project.test.ts: replace execSync("mkdir -p ...") with
  mkdirSync(sub, { recursive: true }) for platform portability.

Author: efenex

src/hooks/_project.ts

@@ -24,7 +24,7 @@ export function resolveProject(cwd?: string): string {
   const explicit = process.env["AGENTMEMORY_PROJECT_NAME"];
   if (explicit && explicit.trim()) return explicit.trim();
 
-  const dir = cwd && cwd.trim() ? cwd : process.cwd();
+  const dir = cwd?.trim() || process.cwd();
 
   try {
     const top = execSync("git rev-parse --show-toplevel", {

src/hooks/notification.ts

@@ -34,7 +34,10 @@ async function main() {
   if (data.notification_type !== "permission_prompt") return;
 
   const sessionId = (data.session_id as string) || "unknown";
-  const cwd = (data.cwd as string) || process.cwd();
+  const cwd =
+    typeof data.cwd === "string" && data.cwd.length > 0
+      ? data.cwd
+      : process.cwd();
   const project = resolveProject(cwd);
 
   try {

test/hook-project.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, beforeEach, describe, expect, it } from "vitest";
-import { mkdtempSync, rmSync } from "node:fs";
+import { mkdirSync, mkdtempSync, rmSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join, basename } from "node:path";
 import { execSync } from "node:child_process";
@@ -42,7 +42,7 @@ describe("resolveProject (#lesson-visibility-pt2)", () => {
     try {
       execSync("git init --quiet", { cwd: tmp });
       const sub = join(tmp, "src", "deep");
-      execSync(`mkdir -p ${sub}`);
+      mkdirSync(sub, { recursive: true });
       // When called from a subdirectory of the repo, project is still the
       // repo basename, not the subdirectory basename. This handles sessions
       // started inside subtrees (e.g. /repo/src/foo).