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/patch_v10_test.py

@@ -0,0 +1,122 @@
+"""patch_v10_test.py <pid> [--revert]
+
+v10: NOP the visible=false branch of UIElement_ItemList::OnVisibilityChanged
+so it ALWAYS calls UpdateEmptySlots (instead of only when becoming visible).
+
+Combined with v8-minimal (which makes UpdateEmptySlots run despite the
+visibility check inside it), this drains the WAITING-state UIItem pool
+on every panel close.
+
+REQUIRES v8-minimal to be applied first (otherwise UpdateEmptySlots
+bails immediately on the IsVisible() check inside).
+
+Site:
+  0x004E49AD: 74 07   jz +0x07 → skip UpdateEmptySlots when vis==false
+  Replace:    90 90   nop nop  → fall through, always call UpdateEmptySlots
+
+Just 2 bytes changed. The simplest patch yet.
+
+Risk:
+  - v10 alone (without v8): UpdateEmptySlots would be called on hide but
+    immediately bail at IsVisible() — no-op. Safe degradation.
+  - v10 + v8: existing trim logic drains pool on hide. Same code that
+    safely runs on show transitions.
+"""
+import argparse
+import ctypes
+import ctypes.wintypes as wt
+import sys
+
+
+SITE_VA   = 0x004E49AD
+ORIG_BYTES = bytes([0x74, 0x07])
+NOP_BYTES  = bytes([0x90, 0x90])
+
+
+PROCESS_VM_READ           = 0x0010
+PROCESS_VM_WRITE          = 0x0020
+PROCESS_VM_OPERATION      = 0x0008
+PROCESS_QUERY_INFORMATION = 0x0400
+PAGE_EXECUTE_READWRITE    = 0x40
+
+
+k32 = ctypes.windll.kernel32
+OpenProcess = k32.OpenProcess
+OpenProcess.argtypes = [wt.DWORD, wt.BOOL, wt.DWORD]; OpenProcess.restype = wt.HANDLE
+CloseHandle = k32.CloseHandle
+CloseHandle.argtypes = [wt.HANDLE]; CloseHandle.restype = wt.BOOL
+WriteProcessMemory = k32.WriteProcessMemory
+WriteProcessMemory.argtypes = [wt.HANDLE, wt.LPVOID, wt.LPCVOID, ctypes.c_size_t,
+                               ctypes.POINTER(ctypes.c_size_t)]
+WriteProcessMemory.restype = wt.BOOL
+ReadProcessMemory = k32.ReadProcessMemory
+ReadProcessMemory.argtypes = [wt.HANDLE, wt.LPCVOID, wt.LPVOID, ctypes.c_size_t,
+                              ctypes.POINTER(ctypes.c_size_t)]
+ReadProcessMemory.restype = wt.BOOL
+VirtualProtectEx = k32.VirtualProtectEx
+VirtualProtectEx.argtypes = [wt.HANDLE, wt.LPVOID, ctypes.c_size_t, wt.DWORD,
+                             ctypes.POINTER(wt.DWORD)]
+VirtualProtectEx.restype = wt.BOOL
+
+
+def read_bytes(h, addr, n):
+    buf = (ctypes.c_ubyte * n)()
+    sz = ctypes.c_size_t(0)
+    if not ReadProcessMemory(h, addr, buf, n, ctypes.byref(sz)):
+        raise OSError(f"read 0x{addr:08x} err={ctypes.get_last_error()}")
+    return bytes(buf[:sz.value])
+
+
+def write_bytes(h, addr, data):
+    old_prot = wt.DWORD(0)
+    if not VirtualProtectEx(h, addr, len(data), PAGE_EXECUTE_READWRITE, ctypes.byref(old_prot)):
+        raise OSError(f"VirtualProtectEx 0x{addr:08x} err={ctypes.get_last_error()}")
+    sz = ctypes.c_size_t(0)
+    ok = WriteProcessMemory(h, addr, data, len(data), ctypes.byref(sz))
+    err = ctypes.get_last_error() if not ok else 0
+    restored = wt.DWORD(0)
+    VirtualProtectEx(h, addr, len(data), old_prot.value, ctypes.byref(restored))
+    if not ok:
+        raise OSError(f"write 0x{addr:08x} err={err}")
+
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument("pid", type=int)
+    ap.add_argument("--revert", action="store_true")
+    args = ap.parse_args()
+
+    h = OpenProcess(
+        PROCESS_VM_READ | PROCESS_VM_WRITE | PROCESS_VM_OPERATION | PROCESS_QUERY_INFORMATION,
+        False, args.pid,
+    )
+    if not h:
+        print(f"OpenProcess({args.pid}) err={ctypes.get_last_error()}"); sys.exit(2)
+
+    cur = read_bytes(h, SITE_VA, 2)
+    print(f"PID {args.pid}")
+    print(f"  site @ 0x{SITE_VA:08x} current: {cur.hex()}")
+
+    if args.revert:
+        if cur == ORIG_BYTES:
+            print(f"    already original — nothing to revert")
+        elif cur == NOP_BYTES:
+            write_bytes(h, SITE_VA, ORIG_BYTES)
+            print(f"    reverted; bytes now: {read_bytes(h, SITE_VA, 2).hex()}")
+        else:
+            print(f"    UNEXPECTED bytes — refusing"); sys.exit(3)
+        CloseHandle(h); return
+
+    if cur == NOP_BYTES:
+        print(f"    already patched")
+    elif cur == ORIG_BYTES:
+        write_bytes(h, SITE_VA, NOP_BYTES)
+        print(f"    patched; bytes now: {read_bytes(h, SITE_VA, 2).hex()}")
+    else:
+        print(f"    UNEXPECTED bytes — refusing. Expected: {ORIG_BYTES.hex()}")
+        sys.exit(4)
+    CloseHandle(h)
+
+
+if __name__ == "__main__":
+    main()