fix(cli): use --name flag in gateway destroy hint messages

The gateway destroy command accepts the gateway name via --name flag,
not as a positional argument. Hint messages shown in error diagnostics
were using positional syntax (e.g. 'openshell gateway destroy openshell')
which produces 'error: unexpected argument found' when copy-pasted.

Author: drew

crates/openshell-bootstrap/src/errors.rs

@@ -176,7 +176,9 @@ fn diagnose_corrupted_state(gateway_name: &str) -> GatewayFailureDiagnosis {
         recovery_steps: vec![
             RecoveryStep::with_command(
                 "Destroy and recreate the gateway",
-                format!("openshell gateway destroy {gateway_name} && openshell gateway start"),
+                format!(
+                    "openshell gateway destroy --name {gateway_name} && openshell gateway start"
+                ),
             ),
             RecoveryStep::with_command(
                 "If that fails, remove the volume for a clean slate",
@@ -226,7 +228,7 @@ fn diagnose_port_conflict(_gateway_name: &str) -> GatewayFailureDiagnosis {
             ),
             RecoveryStep::with_command(
                 "Or stop other openshell gateways",
-                "openshell gateway list && openshell gateway destroy <name>",
+                "openshell gateway list && openshell gateway destroy --name <name>",
             ),
         ],
         retryable: false,
@@ -276,7 +278,9 @@ fn diagnose_k3s_dns_proxy_failure(gateway_name: &str) -> GatewayFailureDiagnosis
             RecoveryStep::with_command("Prune Docker networks", "docker network prune -f"),
             RecoveryStep::with_command(
                 "Destroy and recreate the gateway",
-                format!("openshell gateway destroy {gateway_name} && openshell gateway start"),
+                format!(
+                    "openshell gateway destroy --name {gateway_name} && openshell gateway start"
+                ),
             ),
         ],
         retryable: true,
@@ -341,7 +345,9 @@ fn diagnose_node_pressure(gateway_name: &str) -> GatewayFailureDiagnosis {
             ),
             RecoveryStep::with_command(
                 "Destroy and recreate the gateway after freeing resources",
-                format!("openshell gateway destroy {gateway_name} && openshell gateway start"),
+                format!(
+                    "openshell gateway destroy --name {gateway_name} && openshell gateway start"
+                ),
             ),
         ],
         retryable: false,
@@ -364,7 +370,9 @@ fn diagnose_missing_supervisor(gateway_name: &str) -> GatewayFailureDiagnosis {
             ),
             RecoveryStep::with_command(
                 "Destroy and recreate the gateway with the updated image",
-                format!("openshell gateway destroy {gateway_name} && openshell gateway start"),
+                format!(
+                    "openshell gateway destroy --name {gateway_name} && openshell gateway start"
+                ),
             ),
             RecoveryStep::new(
                 "Or set OPENSHELL_CLUSTER_IMAGE to a cluster image version that includes \
@@ -383,7 +391,7 @@ fn diagnose_certificate_issue(gateway_name: &str) -> GatewayFailureDiagnosis {
             .to_string(),
         recovery_steps: vec![RecoveryStep::with_command(
             "Destroy and recreate the gateway to regenerate certificates",
-            format!("openshell gateway destroy {gateway_name} && openshell gateway start"),
+            format!("openshell gateway destroy --name {gateway_name} && openshell gateway start"),
         )],
         retryable: false,
     }
@@ -436,7 +444,9 @@ pub fn generic_failure_diagnosis(gateway_name: &str) -> GatewayFailureDiagnosis
         recovery_steps: vec![
             RecoveryStep::with_command(
                 "Try destroying and recreating the gateway",
-                format!("openshell gateway destroy {gateway_name} && openshell gateway start"),
+                format!(
+                    "openshell gateway destroy --name {gateway_name} && openshell gateway start"
+                ),
             ),
             RecoveryStep::with_command(
                 "Check container logs for details",

crates/openshell-bootstrap/src/lib.rs

@@ -280,7 +280,7 @@ where
             return Err(miette::miette!(
                 "Gateway '{name}' already exists (container_running={}).\n\
                  Use --recreate to destroy and redeploy, or destroy it first with:\n\n    \
-                 openshell gateway destroy {name}",
+                 openshell gateway destroy --name {name}",
                 existing.container_running,
             ));
         }

crates/openshell-cli/src/run.rs

@@ -1848,7 +1848,7 @@ pub async fn sandbox_create(
                 eprintln!();
                 eprintln!(
                     "    {} && {}",
-                    format!("openshell gateway destroy {gateway_name}").cyan(),
+                    format!("openshell gateway destroy --name {gateway_name}").cyan(),
                     "openshell gateway start".cyan(),
                 );
                 eprintln!();