feat(syscall): add uname syscall + uname userland program

[FlareCoding]

Summary

Implements the Linux-compatible uname(2) syscall and a userland uname utility.

Kernel changes

• config.mk — Added STLX_VERSION ?= 3.0.1, single source of truth for the kernel version string.
• kernel/Makefile — Passes STLX_VERSION to the compiler as -DSTLX_VERSION.
• kernel/syscall/handlers/sys_uname.h / sys_uname.cpp — Implements sys_uname: fills a new_utsname struct using STLX_VERSION for release/version fields, copies to userspace.
• kernel/arch/x86_64/syscall/linux_syscalls.h — UNAME = 63.
• kernel/arch/aarch64/syscall/linux_syscalls.h — UNAME = 160.
• kernel/syscall/syscall_table.cpp — Registers the handler.

Userland changes

• userland/apps/uname/ — New uname utility with Linux-compatible flags:
  • -s kernel name, -n hostname, -r release, -v version, -m machine
  • -a all fields, --help usage
  • Defaults to -s with no arguments
• userland/apps/Makefile — Added uname to APP_DIRS.

utsname fields

Field	Value
sysname	"Stellux"
nodename	"stellux"
release	STLX_VERSION (currently "3.0.1")
version	"Stellux " STLX_VERSION (currently "Stellux 3.0.1")
machine	"x86_64" or "aarch64" (compile-time)
domainname	"(none)"

Testing

• Kernel builds cleanly on both x86_64 and aarch64 with zero errors/warnings.
• Userland app cannot be compiled in CI without musl sysroot but follows established app conventions.

  

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