test: build proxy command paths per platform

The ProxyCommand expectations hardcoded POSIX separators, so they failed
on Windows, where the paths are joined with backslashes and then quoted.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: EhabY

test/unit/remote/remote.test.ts

@@ -6,6 +6,7 @@ import { MementoManager } from "@/core/mementoManager";
 import { PathResolver } from "@/core/pathResolver";
 import { SecretsManager } from "@/core/secretsManager";
 import { Remote, workspaceLabelSuffix } from "@/remote/remote";
+import { escapeCommandArg } from "@/util";
 
 import { createTestTelemetryService } from "../../mocks/telemetry";
 import {
@@ -50,13 +51,20 @@ const CLI_AUTH: CliAuth = {
 	allowRedirects: false,
 };
 
+const PATH_RESOLVER = new PathResolver("/mock/global", "/mock/log");
+// Paths are separated and quoted per platform, so build them the same way.
+const NETWORK_INFO_DIR = escapeCommandArg(PATH_RESOLVER.getNetworkInfoPath());
+const SESSION_TOKEN_FILE = escapeCommandArg(
+	PATH_RESOLVER.getSessionTokenPath(SAFE_HOSTNAME),
+);
+const URL_FILE = escapeCommandArg(PATH_RESOLVER.getUrlPath(SAFE_HOSTNAME));
+
 function createRemote(logger: Logger = createMockLogger()) {
 	new MockConfigurationProvider();
 	const userInteraction = new MockUserInteraction();
-	const pathResolver = new PathResolver("/mock/global", "/mock/log");
 	vol.fromJSON({
-		[pathResolver.getUrlPath(SAFE_HOSTNAME)]: MISMATCHED_URL,
-		[pathResolver.getSessionTokenPath(SAFE_HOSTNAME)]: SESSION_TOKEN,
+		[PATH_RESOLVER.getUrlPath(SAFE_HOSTNAME)]: MISMATCHED_URL,
+		[PATH_RESOLVER.getSessionTokenPath(SAFE_HOSTNAME)]: SESSION_TOKEN,
 	});
 	const secretsManager = new SecretsManager(
 		new InMemorySecretStorage(),
@@ -69,7 +77,7 @@ function createRemote(logger: Logger = createMockLogger()) {
 	const mementoManager = new MementoManager(new InMemoryMemento());
 	const serviceContainer = createMockServiceContainer({
 		logger,
-		pathResolver,
+		pathResolver: PATH_RESOLVER,
 		mementoManager,
 		cliManager: {} as CliManager,
 		contextManager: {
@@ -246,15 +254,13 @@ describe("ProxyCommand", () => {
 			name: "appends disable-autostart after user SSH flags",
 			wildcard: true,
 			flags: ["--disable-autostart=false", "--wait=yes"],
-			expected:
-				"/mock/coder --global-config /mock/global --url https://coder.example.com ssh --disable-autostart=false --wait=yes --disable-autostart --stdio --usage-app=vscode --network-info-dir /mock/global/net --ssh-host-prefix coder-vscode.coder.example.com-- %h",
+			expected: `/mock/coder --global-config /mock/global --url https://coder.example.com ssh --disable-autostart=false --wait=yes --disable-autostart --stdio --usage-app=vscode --network-info-dir ${NETWORK_INFO_DIR} --ssh-host-prefix coder-vscode.coder.example.com-- %h`,
 		},
 		{
 			name: "keeps disable-autostart out of the legacy vscodessh command",
 			wildcard: false,
 			flags: ["--disable-autostart", "--wait=yes"],
-			expected:
-				"/mock/coder --global-config /mock/global --url https://coder.example.com vscodessh --network-info-dir /mock/global/net --session-token-file /mock/global/coder.example.com/session --url-file /mock/global/coder.example.com/url %h",
+			expected: `/mock/coder --global-config /mock/global --url https://coder.example.com vscodessh --network-info-dir ${NETWORK_INFO_DIR} --session-token-file ${SESSION_TOKEN_FILE} --url-file ${URL_FILE} %h`,
 		},
 	])("$name", async ({ wildcard, flags, expected }) => {
 		const { remote } = createRemote();