fix: restore surrogate default in pyhl binary main()

Signed-off-by: danbugs <danilochiarlone@gmail.com>

Author: danbugs

host/src/bin/pyhl.rs

@@ -581,6 +581,7 @@ fn fresh_seed() -> u128 {
 // -- main ---------------------------------------------------------------------
 
 fn main() -> Result<()> {
+    hyperlight_unikraft::pyhl::default_surrogate_count();
     let cli = Cli::parse();
     match cli.cmd {
         Command::Setup(args) => cmd_setup(args),

host/src/pyhl.rs

@@ -54,7 +54,7 @@ use crate::{Preopen, Sandbox};
 /// callers would pay on the very first sandbox. Pinning the default to 1
 /// drops that to ~7 ms. Callers (or the embedding binary) can still
 /// override by setting the env var before calling into `pyhl`.
-fn default_surrogate_count() {
+pub fn default_surrogate_count() {
     if std::env::var_os("HYPERLIGHT_INITIAL_SURROGATES").is_none() {
         // Safety: must be called before any sandbox is created and
         // before additional threads are spawned.