feat: unify system status codes

programs/src/shell/main.cpp

@@ -194,7 +194,7 @@ static int process_command(const char* line) {
             : montauk::abi::POWER_REQ_SHUTDOWN;
         int rc = montauk::power_request(action);
         if (rc == 0) montauk::exit(0);
-        montauk::print(rc == montauk::abi::SYS_ERR_PERMISSION
+        montauk::print(rc == montauk::CapabilityDenied
             ? "power: permission denied\n"
             : "power: request failed\n");
         return 1;
@@ -202,7 +202,7 @@ static int process_command(const char* line) {
 
     if (streq(cmd, "suspend")) {
         int rc = montauk::suspend();
-        if (rc == montauk::abi::SYS_ERR_PERMISSION)
+        if (rc == montauk::CapabilityDenied)
             montauk::print("suspend: permission denied\n");
         return rc == 0 ? 0 : 1;
     }