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/probe_csurface.py

@@ -0,0 +1,76 @@
+"""probe_csurface.py <pid>
+Walk s_Resources, find CSurface entries (vfptr=0x007ca4dc — GR-view).
+Split live vs lost, sample buffer/field non-NULL counts.
+
+CSurface members (primary-relative):
+  +0x58 type, +0x5c handler, +0x60 color, +0x64 solid_index, +0x68 indexed_tex_id
+  +0x6c base1map (ImgTex*)         => entry+0x3c   (PurgeResource releases this)
+  +0x70 base1pal (Palette*)        => entry+0x40   (Destroy releases — PurgeResource MISSES)
+  +0x74 translucency, +0x78 luminosity, +0x7c diffuse
+  +0x80 orig_texture_id, +0x84 orig_palette_id, +0x88 orig_lum, +0x8c orig_diff
+"""
+import ctypes, ctypes.wintypes as wt, sys, struct
+
+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
+
+S_RESOURCES_M_DATA = 0x008398C4
+S_RESOURCES_M_NUM  = 0x008398CC
+CSURFACE_GR_VTABLE = 0x007ca4dc
+
+def rd_u32(h, va):
+    buf = (ctypes.c_ubyte * 4)(); sz = ctypes.c_size_t(0)
+    if not k.ReadProcessMemory(h, va, buf, 4, ctypes.byref(sz)) or sz.value != 4: return None
+    return struct.unpack('<I', bytes(buf))[0]
+
+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)
+
+m_data = rd_u32(h, S_RESOURCES_M_DATA)
+m_num  = rd_u32(h, S_RESOURCES_M_NUM)
+print(f"pid {pid}: s_Resources m_data=0x{m_data:08x} m_num={m_num}")
+
+total = 0; lost = 0; live = 0
+# Per-field non-NULL counters
+lost_base1map = lost_base1pal = 0
+live_base1map = live_base1pal = 0
+samples = []
+
+for i in range(min(m_num, 200000)):
+    entry = rd_u32(h, m_data + i * 4)
+    if not entry: continue
+    vt = rd_u32(h, entry)
+    if vt != CSURFACE_GR_VTABLE: continue
+    total += 1
+    bIsLost_word = rd_u32(h, entry + 8)
+    is_lost = (bIsLost_word & 0xFF) != 0
+    base1map = rd_u32(h, entry + 0x3c)   # primary+0x6c
+    base1pal = rd_u32(h, entry + 0x40)   # primary+0x70
+    handler  = rd_u32(h, entry + 0x2c)   # primary+0x5c
+    if base1map is None or base1pal is None: continue
+    if is_lost:
+        lost += 1
+        if base1map != 0: lost_base1map += 1
+        if base1pal != 0: lost_base1pal += 1
+        if (base1map != 0 or base1pal != 0) and len(samples) < 5:
+            samples.append(('LOST', entry, base1map, base1pal, handler))
+    else:
+        live += 1
+        if base1map != 0: live_base1map += 1
+        if base1pal != 0: live_base1pal += 1
+        if (base1map != 0 or base1pal != 0) and len(samples) < 10:
+            samples.append(('LIVE', entry, base1map, base1pal, handler))
+
+print(f"CSurface entries: total={total} live={live} lost={lost}")
+print(f"  LOST: base1map non-NULL  {lost_base1map}/{lost} ({100*lost_base1map//max(lost,1)}%)")
+print(f"  LOST: base1pal non-NULL  {lost_base1pal}/{lost} ({100*lost_base1pal//max(lost,1)}%)")
+print(f"  LIVE: base1map non-NULL  {live_base1map}/{live} ({100*live_base1map//max(live,1)}%)")
+print(f"  LIVE: base1pal non-NULL  {live_base1pal}/{live} ({100*live_base1pal//max(live,1)}%)")
+print(f"  Samples:")
+for status, entry, m, p, h_ in samples:
+    print(f"    [{status}] entry=0x{entry:08x} base1map=0x{m:08x} base1pal=0x{p:08x} handler=0x{h_:08x}")