feat: exhaustive STUB instrumentation - 241 panic sites across VMM/kernel + whitelist alignment

- VMM cluster: XJ3-E/LIN-E/VMM-E/VMX-E/EPT-E/IPC-E/VVB-E (124 sites)

- kernel cluster: TST-E/MM-E/UTRW-E/LAPIC-E/IDT-E/SAS-E/PRB-E/NETST-E/DKM-E (117 sites)

- whitelist fixes: vmm_init env probes E10-E14 fallback, disk_log read-only block path, DSL-E05 non-FAT32 device 0 probe

- QEMU smoke: wizard -> USER.CONF -> login -> desktop ready, zero spurious panic

CODE/UTSM/kernel/probe.c

@@ -15,6 +15,7 @@
 #include <utsm/log.h>
 #include <utsm/types.h>
 #include <utsm/arena.h>
+#include <utsm/panic.h>
 #include "ini_parser.h"
 
 /* ---- 探测缓冲状态 ---- */
@@ -39,6 +40,8 @@ void probe_init(const void *cfg_ptr) {
     if (!g_probe_buf) {
         g_instr_probe_enable = 0;
         log_warn("[PROBE] arena alloc failed, probe disabled");
+        panic_full("PRB-E01 PROBE ARENA ALLOC FAILED",
+                   "probe_init: probe buffer arena allocation failed", 0);
         return;
     }