perf(async): remove blocking std::process::Command from async paths

Every production process spawn reachable from a tokio worker now uses
tokio::process: the install path's podman-port probe, the dependencies
disk check, factory-reset restart, config host-IP detection, the
orchestrator's host-facts helpers (resolve_dynamic_env and its call
sites made async to carry it through), and AutoRuntime's podman/docker
probes.

The FIPS transport probe is the special case: is_available() is a sync
trait method called from async route(), so instead of blocking ~50ms
on systemctl per stale-cache hit it now serves the cached value and
refreshes on a background thread (stale-while-revalidate) — bounded
staleness, zero stalled workers.

§C of the 1.8.0 hardening plan; container/transport/config/package
suites green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/archipelago/src/api/rpc/package/dependencies.rs

@@ -472,7 +472,7 @@ pub(super) async fn check_bitcoin_pruning_compatibility(package_id: &str) -> Res
         tokio::time::sleep(std::time::Duration::from_secs(2)).await;
     }
 
-    if detect_disk_gb() < ARCHIVAL_BITCOIN_DISK_GB {
+    if detect_disk_gb().await < ARCHIVAL_BITCOIN_DISK_GB {
         anyhow::bail!(archival_bitcoin_required_message(package_id));
     }
 
@@ -497,10 +497,11 @@ fn check_blockchain_info_for_pruning(package_id: &str, json: &serde_json::Value)
     Ok(())
 }
 
-fn detect_disk_gb() -> u64 {
-    let output = std::process::Command::new("df")
+async fn detect_disk_gb() -> u64 {
+    let output = tokio::process::Command::new("df")
         .args(["-BG", "/var/lib/archipelago"])
-        .output();
+        .output()
+        .await;
     let Ok(output) = output else {
         return u64::MAX;
     };

core/archipelago/src/api/rpc/package/install.rs

@@ -2196,13 +2196,14 @@ async fn ensure_host_port_listener(
     container_name: &str,
     runtime_ports: &[String],
 ) -> Result<()> {
-    let Some(port) = runtime_ports
+    let mut port = runtime_ports
         .first()
         .and_then(|p| p.split(':').next())
-        .and_then(|p| p.parse::<u16>().ok())
-        .or_else(|| published_host_port(container_name))
-        .or_else(|| required_host_port(package_id))
-    else {
+        .and_then(|p| p.parse::<u16>().ok());
+    if port.is_none() {
+        port = published_host_port(container_name).await;
+    }
+    let Some(port) = port.or_else(|| required_host_port(package_id)) else {
         return Ok(());
     };
 
@@ -2248,10 +2249,11 @@ async fn ensure_host_port_listener(
     ))
 }
 
-fn published_host_port(container_name: &str) -> Option<u16> {
-    let output = std::process::Command::new("podman")
+async fn published_host_port(container_name: &str) -> Option<u16> {
+    let output = tokio::process::Command::new("podman")
         .args(["port", container_name])
         .output()
+        .await
         .ok()?;
     if !output.status.success() {
         return None;

core/archipelago/src/api/rpc/system/handlers.rs

@@ -575,7 +575,7 @@ impl RpcHandler {
         // Restart the service via systemd
         tokio::spawn(async {
             tokio::time::sleep(std::time::Duration::from_secs(2)).await;
-            let _ = std::process::Command::new("sudo")
+            let _ = tokio::process::Command::new("sudo")
                 .args(["systemctl", "restart", "archipelago"])
                 .spawn();
         });