Run release smoke test against web --foreground

#1020 moved the foreground web server behind `executor web --foreground`:
plain `executor web` now opens the installed background service and prints
"Executor is not running" when none exists. The release-bootstrap smoke
test still invoked `executor web --port`, so it never got a served
response and the v1.5.12 publish gate failed at release:check. Pass
--foreground to exercise the same runForegroundSession path the test was
written for.

Author: RhysSullivan

tests/release-bootstrap-smoke.test.ts

@@ -145,7 +145,7 @@ describe("release bootstrap smoke", () => {
 
       const webProcess = spawn(
         process.execPath,
-        [join(installedWrapperDir, "bin", "executor"), "web", "--port", String(webPort)],
+        [join(installedWrapperDir, "bin", "executor"), "web", "--foreground", "--port", String(webPort)],
         {
           cwd: installedWrapperDir,
           env: {