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/dump_vtable.py

@@ -0,0 +1,68 @@
+"""dump_vtable.py <pid> <vtable_va> [n_slots=16]
+Read N vtable slots from a live process and dump first 16 bytes of each.
+Useful for fingerprinting classes — compare slot patterns to known vtables."""
+import ctypes, ctypes.wintypes as wt, sys
+
+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.CloseHandle.argtypes = [wt.HANDLE]
+k.CloseHandle.restype = wt.BOOL
+k.ReadProcessMemory.argtypes = [wt.HANDLE, wt.LPCVOID, wt.LPVOID,
+                                ctypes.c_size_t, ctypes.POINTER(ctypes.c_size_t)]
+k.ReadProcessMemory.restype = wt.BOOL
+
+def read(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])
+
+def main():
+    pid = int(sys.argv[1])
+    vt_va = int(sys.argv[2], 0)
+    n_slots = int(sys.argv[3]) if len(sys.argv) > 3 else 16
+
+    h = k.OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, False, pid)
+    if not h:
+        print(f"OpenProcess pid={pid} err={ctypes.get_last_error()}")
+        sys.exit(2)
+
+    # Read N slots (4 bytes each)
+    slot_bytes = read(h, vt_va, n_slots * 4)
+    if not slot_bytes:
+        print(f"ReadProcessMemory @ vtable 0x{vt_va:08x} err={ctypes.get_last_error()}")
+        sys.exit(3)
+
+    print(f"vtable @ 0x{vt_va:08x} in pid {pid}")
+    slots = []
+    for i in range(n_slots):
+        slot = int.from_bytes(slot_bytes[i*4:i*4+4], 'little')
+        slots.append(slot)
+
+    for i, slot in enumerate(slots):
+        prologue = read(h, slot, 16) if slot else None
+        if prologue:
+            hexs = prologue.hex(' ')
+            hints = []
+            if prologue[:1] == b'\x55': hints.append("push ebp")
+            if prologue[:1] == b'\x56': hints.append("push esi")
+            if prologue[:1] == b'\x53': hints.append("push ebx")
+            if prologue[:3] == b'\xb0\x01\xc3': hints.append("mov al,1;ret (return-true stub)")
+            if prologue[:3] == b'\xb0\x00\xc3': hints.append("mov al,0;ret (return-false stub)")
+            if prologue[:3] == b'\x33\xc0\xc3': hints.append("xor eax,eax;ret (return-0 stub)")
+            if prologue[:1] == b'\xc3': hints.append("bare ret (pure no-op)")
+            if prologue[:1] == b'\xc2': hints.append(f"retn imm16")
+            if prologue[:2] == b'\xe9\x00' or prologue[:1] == b'\xe9': hints.append("jmp (thunk)")
+            hint_str = "  -- " + "; ".join(hints) if hints else ""
+            print(f"  slot[{i:2d}] = 0x{slot:08x}  {hexs}{hint_str}")
+        else:
+            print(f"  slot[{i:2d}] = 0x{slot:08x}  (unreadable)")
+
+    k.CloseHandle(h)
+
+if __name__ == '__main__':
+    main()