feat(kernel): add PL011 UART console and arch I/O helpers

- Add IOSerial: PL011 (0x0900_0000) TX with FIFO-full polling, yield while waiting
- Add Arch/IO.h (32-bit MMIO with DSB) and Arch/CPU.h (yield, WFI)
- Extend types.h (e.g. ASCII, Address, Int/UInt aliases)
- Wire KernelMain to IOSerialPutString for early boot output
- Drop .sourcekit-lsp config; note IO glob in CMake (commented)

Kernel/CMakeLists.txt

@@ -5,6 +5,7 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 file(GLOB_RECURSE KERNEL_SOURCES CMAKE_CONFIGURE_DEPENDS 
     ${CMAKE_CURRENT_SOURCE_DIR}/Source/KernelMain.c
     ${CMAKE_CURRENT_SOURCE_DIR}/Source/Arch/entry.S
+#    ${CMAKE_CURRENT_SOURCE_DIR}/Source/IO/*.c
     ${CMAKE_CURRENT_SOURCE_DIR}/Source/**/*.c
 )