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/pe/pe_loader.c

@@ -144,7 +144,11 @@ static void apply_relocations(u8 *image, u32 image_size, u64 image_base_actual,
                 val += (u32)delta;
                 *(u32 *)target = val;
             } else {
-                /* 其他重定位类型暂不支持 */
+                /* 严格错误策略插桩：未实现的重定位类型静默跳过 = 重定位
+                 * 不完整照跑，零降级 panic（PE-E03）。 */
+                log_error("[PE] unsupported reloc type");
+                panic_full("PE-E03 RELOC TYPE NOT IMPLEMENTED",
+                           "PE base-reloc type outside ABSOLUTE/HIGHLOW/DIR64: not implemented", 0);
             }
         }
         block_rva += block_size;