feat(kernel): console cap gates DebugPutchar, no uart fast path; spawn start arg in a0; delegate returns slot

crates/adapter-riscv/src/devices/mod.rs

@@ -3,7 +3,6 @@
 use crate::hw::uart::Uart;
 use types::address::VirtualAddress;
 use types::bootinfo::{BOOT_INFO_VA, BootDevice, BootInfo, MAGIC, MAX_BOOT_DEVICES, NO_SLOT};
-use types::bounded::CapSlot;
 use types::id::ProcessId;
 use types::mapping::PagePerms;
 
@@ -29,7 +28,7 @@ pub(crate) fn boot_info(
     board: &[kernel::BoardDevice],
     kinds: &[u64],
     placed: &[Option<kernel::BoardCaps>],
-    system_control: CapSlot,
+    boot_caps: kernel::BootCaps,
 ) {
     let empty = BootDevice {
         kind: 0,
@@ -42,7 +41,8 @@ pub(crate) fn boot_info(
     let mut info = BootInfo {
         magic: MAGIC,
         device_count: 0,
-        system_control_slot: system_control.value() as u64,
+        system_control_slot: boot_caps.system_control.value() as u64,
+        console_slot: boot_caps.console.value() as u64,
         devices: [empty; MAX_BOOT_DEVICES],
     };
     for (((d, kind), caps), out) in board