Keep real Git streaming stress coverage portable on macOS

Retain forty thousand files and four filename lanes above 32 MiB while fitting the macOS path limit. Allow 300 seconds for real filesystem staging/deletion on macOS and retain the 180-second bound elsewhere.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/services/workspace-git-snapshot-streaming.test.ts

@@ -51,8 +51,10 @@ function localClient(commands: string[]): SandboxManagedRuntimeClient {
   };
 }
 
+// macOS adds per-file process and filesystem overhead to the real deletion lane.
+const realGitTimeoutMs = process.platform === "darwin" ? 300_000 : 180_000;
 it("streams and stages all four real Git filename lanes above 32 MiB through the shared scheduler", async () => {
-  const root = await fs.mkdtemp(path.join(os.tmpdir(), "paperclip-streaming-real-git-"));
+  const root = await fs.realpath(await fs.mkdtemp(path.join(os.tmpdir(), "pc-stream-git-")));
   directories.push(root);
   const repo = path.join(root, "repo");
   await fs.mkdir(repo);
@@ -60,7 +62,9 @@ it("streams and stages all four real Git filename lanes above 32 MiB through the
   const git = (args: string[]) => runLocalGit(repo, args, { env, timeout: 120_000, maxBuffer: 64 * 1024 });
   await git(["init"]);
   await git(["commit", "--allow-empty", "-qm", "fixture"]);
-  const parent = path.join(repo, ...Array.from({ length: 4 }, () => "nested-".repeat(30)), "storybook-output");
+  // Leave room for the fixture/staging root below macOS's 1,024-byte path
+  // limit while keeping each 40,000-name Git lane above the 32 MiB boundary.
+  const parent = path.join(repo, ...Array.from({ length: 3 }, () => "nested-".repeat(30)), "storybook-output");
   await fs.mkdir(parent, { recursive: true });
   const fileName = (index: number) => `${"asset-".repeat(36)}${index}.js`;
   const writeFiles = async (content: string) => {
@@ -92,7 +96,8 @@ it("streams and stages all four real Git filename lanes above 32 MiB through the
       bytes += Buffer.byteLength(relative) + 1;
     }
     expect(count).toBe(40_000);
-    expect(bytes).toBe(43_428_890);
+    expect(bytes).toBe(34_988_890);
+    expect(bytes).toBeGreaterThan(32 * 1024 * 1024);
   };
   // Standalone callers must use the same streaming semantics.
   setExpensiveWorkspaceGitExecutor(null);
@@ -147,4 +152,4 @@ it("streams and stages all four real Git filename lanes above 32 MiB through the
   expect(remaining).toBe(0);
   expect(commands.every((command) => command.length < 16 * 1024)).toBe(true);
   expect(scheduler.snapshot()).toMatchObject({ activeCount: 0, queuedCount: 0, inFlightCount: 0, cacheBytes: 0 });
-}, 180_000);
+}, realGitTimeoutMs);