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/count_one_pid.py

@@ -0,0 +1,76 @@
+"""count_one_pid.py <pid>
+Quick scan of a single PID for all leak-class vtable counts.
+"""
+import ctypes, ctypes.wintypes as wt, struct, sys
+
+
+VTABLES = {
+    "uiitem":        0x007c0498,
+    "palette":       0x007caa08,
+    "cphysicsobj":   0x007c78ec,
+    "renderSurf":    0x0079a67c,
+    "renderSurfD3D": 0x00801a94,
+    "renderTexD3D":  0x00801a18,
+    "csurface":      0x007ca4dc,
+    "imgtex":        0x007cab04,
+    "cgfxobj":       0x007ca418,
+    "d3dxmesh":      0x007ed3b0,
+}
+
+
+PROCESS_VM_READ = 0x10
+PROCESS_QUERY_INFORMATION = 0x400
+MEM_COMMIT = 0x1000
+MEM_PRIVATE = 0x20000
+
+
+class MBI(ctypes.Structure):
+    _fields_ = [('BaseAddress', ctypes.c_void_p),
+                ('AllocationBase', ctypes.c_void_p),
+                ('AllocationProtect', wt.DWORD),
+                ('PartitionId', wt.WORD),
+                ('RegionSize', ctypes.c_size_t),
+                ('State', wt.DWORD),
+                ('Protect', wt.DWORD),
+                ('Type', wt.DWORD)]
+
+
+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
+k.VirtualQueryEx.argtypes = [wt.HANDLE, ctypes.c_void_p, ctypes.POINTER(MBI), ctypes.c_size_t]
+k.VirtualQueryEx.restype = ctypes.c_size_t
+
+
+pid = int(sys.argv[1])
+h = k.OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, False, pid)
+if not h:
+    print(f"OpenProcess({pid}) failed err={ctypes.get_last_error()}"); sys.exit(2)
+
+counts = {n: 0 for n in VTABLES}
+vt_to_name = {vt: name for name, vt in VTABLES.items()}
+
+mbi = MBI()
+addr = 0
+while k.VirtualQueryEx(h, addr, ctypes.byref(mbi), ctypes.sizeof(mbi)):
+    pr = mbi.Protect & 0xff
+    if (mbi.State == MEM_COMMIT and mbi.Type == MEM_PRIVATE and pr in (0x04, 0x40)):
+        buf = (ctypes.c_ubyte * mbi.RegionSize)()
+        sz = ctypes.c_size_t(0)
+        if k.ReadProcessMemory(h, mbi.BaseAddress, buf, mbi.RegionSize, ctypes.byref(sz)):
+            data = bytes(buf[:sz.value])
+            end = (len(data) // 4) * 4
+            for off in range(0, end, 4):
+                v = struct.unpack_from("<I", data, off)[0]
+                if v in vt_to_name:
+                    counts[vt_to_name[v]] += 1
+    addr = (mbi.BaseAddress or 0) + mbi.RegionSize
+    if addr >= 0x80000000: break
+
+print(f"PID {pid}")
+for n in VTABLES:
+    print(f"  {n:14s} = {counts[n]:6d}")
+k.CloseHandle(h)