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/sample_big_regions.py

@@ -0,0 +1,107 @@
+"""sample_big_regions.py <pid>
+Sample the first 64 bytes of every 256K-1M private RW region.
+Classify by content pattern:
+  - Texture data: every 4th byte looks like alpha (mostly 0xFF or 0x00)
+  - Vtable-headed: first DWORD is in image range (0x00400000-0x00900000)
+  - Heap header: starts with ptr-like values into ranges we recognize
+  - Random/unknown
+Then for vtable-headed regions, report which vtable."""
+import ctypes, ctypes.wintypes as wt, sys, struct, collections
+
+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])
+
+def classify_sample(b, region_size):
+    if not b or len(b) < 32:
+        return ("unreadable", None)
+    # Vtable-headed: first DWORD points into image range
+    first_dw = struct.unpack_from('<I', b, 0)[0]
+    if 0x00400000 <= first_dw <= 0x00900000:
+        return ("vtable", first_dw)
+    # Texture-RGBA: every 4th byte is consistent (alpha channel)
+    alphas = b[3::4][:16]  # 16 alpha samples
+    if len(alphas) >= 8:
+        # Count how many are 0xFF (opaque) or 0x00 (transparent)
+        if alphas.count(0xFF) >= 12 or alphas.count(0x00) >= 12:
+            return ("texture_rgba", None)
+    # All-zero
+    if b.count(0) >= 56:
+        return ("mostly_zero", None)
+    # Float-heavy: many 4-byte words look like reasonable floats
+    floats_in_range = 0
+    for i in range(0, 32, 4):
+        f = struct.unpack_from('<f', b, i)[0]
+        if -10000 < f < 10000 and f != 0.0:
+            floats_in_range += 1
+    if floats_in_range >= 6:
+        return ("float_data", None)
+    return ("unknown", None)
+
+pid = int(sys.argv[1])
+h = k.OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, False, pid)
+if not h: print(f"OpenProcess err={ctypes.get_last_error()}"); sys.exit(2)
+
+classes = collections.Counter()
+class_bytes = collections.Counter()
+vtable_counts = collections.Counter()
+size_distribution = collections.Counter()
+
+mbi = MBI()
+addr = 0
+total_regions = 0
+while k.VirtualQueryEx(h, addr, ctypes.byref(mbi), ctypes.sizeof(mbi)):
+    region_base = mbi.BaseAddress or 0
+    region_size = mbi.RegionSize
+    if (mbi.State == 0x1000 and mbi.Type == 0x20000
+        and (mbi.Protect & 0xFF) in (0x04, 0x40)
+        and 256*1024 <= region_size <= 1024*1024):
+        sample = rd(h, region_base, 64)
+        cls, vt = classify_sample(sample, region_size)
+        classes[cls] += 1
+        class_bytes[cls] += region_size
+        size_distribution[region_size] += 1
+        if cls == "vtable":
+            vtable_counts[vt] += 1
+        total_regions += 1
+    next_addr = region_base + region_size
+    if next_addr <= addr: break
+    addr = next_addr
+    if addr >= 0x80000000: break
+
+k.CloseHandle(h)
+
+def mb(n): return f"{n/(1024*1024):,.1f}"
+
+print(f"=== pid {pid} — 256K-1M private RW region content classification ===")
+print(f"Total regions in size range: {total_regions}")
+print()
+print(f"  {'class':<16} {'count':>6} {'MB':>8}")
+for cls, count in classes.most_common():
+    print(f"  {cls:<16} {count:>6} {mb(class_bytes[cls]):>8}")
+print()
+print("Top region sizes (look for size buckets that match texture dimensions):")
+for sz, n in size_distribution.most_common(15):
+    print(f"  {sz:>10} bytes ({mb(sz):>6} MB)  × {n} regions  total={mb(sz*n):>6} MB")
+print()
+if vtable_counts:
+    print("Vtable-headed regions (top 10 vtables):")
+    for vt, n in vtable_counts.most_common(10):
+        print(f"  0x{vt:08x} × {n}")