fix: add 0x0F (two-byte opcode prefix) to valid prologue bytes

Functions starting with MOVZX/MOVSX (0x0F B6/0x0F BE) were flagged as
unexpected prologues. This is valid for MSVC-generated code.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/openwa-dll/src/startup_checks.rs

@@ -30,6 +30,7 @@ const VALID_PROLOGUES: &[u8] = &[
     0x89, // mov reg, reg
     0x8B, // mov reg, ...
     0x8D, // lea reg, ...
+    0x0F, // two-byte opcode prefix (e.g. movzx, movsx)
     0xA1, // mov eax, [imm32]
     0xB8, // mov eax, imm32
     0xC1, // shr/shl reg, imm8