graphics: synchronize host file writes and depth clipping

Map paired PS5 depth-clip state through Vulkan pipeline creation and preserve asymmetric hard failures. Prepare GPU-mapped guest ranges before kernel file reads so buffer, texture, and alias ownership remains coherent. Add focused regression coverage and update the current launch target.

src/kernel/memory.h

@@ -99,6 +99,7 @@ void SetFlexibleMemorySize(uint64_t size);
 bool TryWriteBacking(uint64_t vaddr, const void* data, uint64_t size);
 bool TryReadBacking(uint64_t vaddr, void* data, uint64_t size);
 void WriteBacking(uint64_t vaddr, const void* data, uint64_t size) noexcept;
+void PrepareHostWrite(uint64_t vaddr, uint64_t size);
 
 int KYTY_SYSV_ABI KernelMapNamedFlexibleMemory(void** addr_in_out, size_t len, int prot, int flags,
                                                const char* name);