feat(sub-lang): Integrate SUB Language (.sb) native kernel modules and in-kernel VM/interpreter

- Add native .sb kernel modules in sub/ (signature.sb, power_governor.sb, benchmark.sb, easter_egg.sb)
- Implement in-kernel SUB Language VM and AST interpreter in kernel/sub/sub_vm.c
- Implement C-interop runtime in kernel/sub/sub_runtime.c and include/kernel/sub_lang.h
- Initialize SUB Language Engine in boot sequence step [8/14] in kernel/main.c
- Implement strtol in lib/string.c
- Add LazyBox applets: 'subinfo', 'subi', 'subpower', 'subbench', and 'subquote'

kernel/main.c

@@ -59,6 +59,7 @@
 #include <net/dhcp.h>
 #include <net/dns.h>
 #include <kernel/rust.h>
+#include <kernel/sub_lang.h>
 #include <net/filter.h>
 #include <net/http.h>
 #include <net/ssh.h>
@@ -141,9 +142,10 @@ static void subos_modular_core_boot(void) {
     printk(ANSI_BRIGHT_GREEN "OK\n" ANSI_RESET);
 #endif
 
-    // Crypto, Certificates, LSM Security, Authentication, Namespaces & Rust Subsystem
-    printk(KERN_INFO "[8/14] Initializing Rust Core, X.509 Keyring, Shadow Auth & Namespaces... ");
+    // Crypto, Certificates, LSM Security, Authentication, Namespaces, Rust & SUB-Lang Subsystems
+    printk(KERN_INFO "[8/14] Initializing Rust Core, SUB-Lang Engine, X.509 Keyring & Auth... ");
     rust_kernel_init();
+    sub_kernel_init();
     prng_seed(0, 0);
     certs_init();
     security_init();