Initial commit — leak-hunt project complete

Five bugs identified and patched in retail Asheron's Call client:
- v3b: palette refcount over-increment (3-byte NOP at two sites)
- v5: RenderSurface PurgeResource no-op stub (vtable slot 2 thunk)
- v11: two dangling-pointer crash guards (NULL-check + reorder)
- v14: CEnvCell::Destroy ClipPlaneList leak (18-byte JMP to cleanup thunk)
- v22: unpacker stale-pointer SEH guard (whole-function __try/__except)

All five ship in leakfix.dll (117 KB, SHA d282f23c…) which is loaded
by acclient.exe at process start via PE import table patching by
tools/install_leakfix.py.

Controlled 15-client fleet soak: unpatched control died at 26h with
palette exhaustion; all 14 patched clients survived past that point
and reached ≥5-day uptime.

Residual ~15 MB/h growth traced to d3d9.dll's internal slab allocator
(260KB surface backing buffers retained after Release). See REPORT.md
§10 for the full investigation; conclusion is that it's unfixable from
outside d3d9.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tools/peek_first_region.py

@@ -0,0 +1,59 @@
+"""peek_first_region.py <pid> <exact_size_bytes>
+Find the first private-RW region of exactly <size>, dump its first 256 bytes
+plus a sample at offset 4096 and at midpoint."""
+import ctypes, ctypes.wintypes as wt, sys, struct
+
+PROCESS_VM_READ = 0x10
+PROCESS_QUERY_INFORMATION = 0x400
+k = ctypes.windll.kernel32
+k.OpenProcess.argtypes = [wt.DWORD, wt.BOOL, wt.DWORD]; k.OpenProcess.restype = wt.HANDLE
+k.ReadProcessMemory.argtypes = [wt.HANDLE, wt.LPCVOID, wt.LPVOID, ctypes.c_size_t, ctypes.POINTER(ctypes.c_size_t)]
+k.ReadProcessMemory.restype = wt.BOOL
+k.VirtualQueryEx.argtypes = [wt.HANDLE, wt.LPCVOID, ctypes.c_void_p, ctypes.c_size_t]
+k.VirtualQueryEx.restype = ctypes.c_size_t
+
+class MBI(ctypes.Structure):
+    _fields_ = [("BaseAddress", ctypes.c_void_p), ("AllocationBase", ctypes.c_void_p),
+                ("AllocationProtect", wt.DWORD), ("RegionSize", ctypes.c_size_t),
+                ("State", wt.DWORD), ("Protect", wt.DWORD), ("Type", wt.DWORD)]
+
+def rd(h, va, n):
+    buf = (ctypes.c_ubyte * n)(); sz = ctypes.c_size_t(0)
+    if not k.ReadProcessMemory(h, va, buf, n, ctypes.byref(sz)): return None
+    return bytes(buf[:sz.value])
+
+pid = int(sys.argv[1]); target_size = int(sys.argv[2])
+h = k.OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, False, pid)
+if not h: print("OpenProcess fail"); sys.exit(2)
+
+mbi = MBI()
+addr = 0
+found = 0
+while k.VirtualQueryEx(h, addr, ctypes.byref(mbi), ctypes.sizeof(mbi)) and found < 3:
+    base = mbi.BaseAddress or 0
+    sz = mbi.RegionSize
+    if (mbi.State == 0x1000 and mbi.Type == 0x20000 and (mbi.Protect & 0xFF) in (0x04, 0x40)
+        and sz == target_size):
+        print(f"\n=== region @ 0x{base:08x}  size={sz} ===")
+        for off in [0, 256, 4096, sz // 2, sz - 64]:
+            data = rd(h, base + off, 64)
+            if data:
+                print(f"  +0x{off:06x}: {data[:32].hex(' ')}")
+                print(f"            {data[32:64].hex(' ')}")
+        # Interpret first 32 bytes as DWORDs and floats
+        data = rd(h, base, 32)
+        if data:
+            print(f"  as DWORDs: ", end='')
+            for i in range(0, 32, 4):
+                print(f"0x{struct.unpack_from('<I', data, i)[0]:08x}", end=' ')
+            print()
+            print(f"  as floats: ", end='')
+            for i in range(0, 32, 4):
+                print(f"{struct.unpack_from('<f', data, i)[0]:.3g}", end=' ')
+            print()
+        found += 1
+    next_addr = base + sz
+    if next_addr <= addr: break
+    addr = next_addr
+    if addr >= 0x80000000: break
+k.CloseHandle(h)