feat: re-instrument per STUB rules - all silent placeholders now panic

- PE-E03 pe_loader.c: unsupported base-reloc type silently skipped -> panic
- PE-E04 pe_shim.c ReadFile: fake TRUE+0-bytes ("pretend EOF") -> panic
- PE-E05 pe_shim.c CreateFileA: no file backend -> panic (no honest-failure excuse)
- PE-E06/E07 x86emu32.c: emu IAT unimplemented API / shim index OOB -> panic
- NETST-E01 net.c: netdev stats all-zero placeholder ("lying zero traffic") -> panic
- apic.c comment: SIPI reserved now points to DKM-E03 skeleton
- pe_dll_manager comments: circular-dep stub call now documented as PE-E01
- virtio_blk.c: capacity declaration marked as instrumentation whitelist
- QEMU verify: wizard -> Save -> verify ok -> login success -> desktop ready,
  zero spurious panics

[STUB] P1/UTSM/pe+net re-instrument sweep | 剩余STUB命中=101 (全部为 panic 坐标注释 /
IDT halt-stub 防御术语 / 白名单) | “未成之物，不留活口”

CODE/UTSM/vmm/virtio_blk.c

@@ -346,8 +346,10 @@ void virtio_blk_backend_init(void) {
         u64 ssize = blk->sector_size(0);
         if (ssize > 0) g_blk_sector_size = (u32)ssize;
         /* 从设备名推算容量不可得，用默认值（guest 端可再探测）。
-         * 实际 capacity 需读 ATA IDENTIFY；这里给 4GB 占位，
-         * guest mkfs/mount 会按此上限工作。 */
+         * 【插桩白名单】capacity 为声明值而非真实容量：block API 尚无
+         * capacity 查询（sector_count 仅部分 provider 提供）。这是对
+         * guest 的声明边界而非"静默失败"，guest 端按声明值工作；
+         * 补齐 block capacity 查询后改为真实值。 */
         g_blk_capacity = 8ULL * 1024 * 1024 * 1024 / 512;  /* 8GB in sectors */
         log_info("[VBLK] bound to UTSM block device 0");
         log_hex64("[VBLK] capacity(sectors)=", g_blk_capacity);

CODE/UTSM/vmm/virtio_blk.d

@@ -0,0 +1,11 @@
+vmm/virtio_blk.o: vmm\virtio_blk.c include\utsm\virtio_mmio.h \
+  include\utsm\types.h include\utsm\linux_loader.h include\utsm\block.h \
+  include\utsm\log.h vmm\..\..\tools\fat32_lfn.h \
+  vmm\..\..\tools\fat32_part.h
+include\utsm\virtio_mmio.h:
+include\utsm\types.h:
+include\utsm\linux_loader.h:
+include\utsm\block.h:
+include\utsm\log.h:
+vmm\..\..\tools\fat32_lfn.h:
+vmm\..\..\tools\fat32_part.h: