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_gr_subclasses_live.py

@@ -0,0 +1,95 @@
+"""count_gr_subclasses_live.py <pid>
+
+Count live instances of each GraphicsResource subclass in a running
+process by scanning RW heap for vtable pointers. Used to measure
+whether v5 PurgeResource patch actually drains the leaked instances
+over time.
+"""
+import argparse, ctypes, ctypes.wintypes as wt, struct, sys, time
+
+
+VTABLES = {
+    "RenderSurface":          0x0079a67c,
+    "RenderTexture":          0x0079c198,
+    "CSurface":               0x007ca4dc,
+    "ImgTex":                 0x007cab04,
+    "RenderVertexBufferD3D":  0x007e6520,
+    "RenderTextureD3D":       0x00801a18,
+    "RenderSurfaceD3D":       0x00801a94,
+    "RenderIndexStreamD3D":   0x00801b64,
+}
+
+
+PROCESS_VM_READ           = 0x0010
+PROCESS_QUERY_INFORMATION = 0x0400
+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.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
+
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument("pid", type=int)
+    args = ap.parse_args()
+
+    h = k.OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, False, args.pid)
+    if not h:
+        print(f"OpenProcess({args.pid}) failed err={ctypes.get_last_error()}")
+        sys.exit(2)
+
+    counts = {name: 0 for name in VTABLES}
+    vt_set = {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)):  # RW or RWX
+            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_set:
+                        counts[vt_set[v]] += 1
+        addr = (mbi.BaseAddress or 0) + mbi.RegionSize
+        if addr >= 0x80000000:
+            break
+
+    ts = time.strftime("%H:%M:%S")
+    print(f"PID {args.pid}  @ {ts}")
+    print(f"{'class':<25} {'vtable':<12} {'count':>6}")
+    for name, vt in VTABLES.items():
+        marker = " <- LEAKING (v5 patches this)" if name in ("RenderSurface", "RenderTexture") else ""
+        print(f"{name:<25} 0x{vt:08x}   {counts[name]:>6}{marker}")
+    total = sum(counts.values())
+    leakers = counts["RenderSurface"] + counts["RenderTexture"]
+    print(f"{'total':<25} {'':<12} {total:>6}")
+    print(f"{'leakers (RS+RT)':<25} {'':<12} {leakers:>6}")
+
+
+if __name__ == "__main__":
+    main()