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/read_vtable.py

@@ -0,0 +1,31 @@
+"""read_vtable.py <dump.dmp> <vtable_addr> [num_slots=16]
+
+Read vtable slot pointers from a minidump.
+"""
+import struct, sys
+from minidump.minidumpfile import MinidumpFile
+
+
+def _ei(v):
+    if v is None: return 0
+    if hasattr(v, 'value'): return int(v.value)
+    return int(v)
+
+
+def main():
+    md = MinidumpFile.parse(sys.argv[1])
+    vt = int(sys.argv[2], 0)
+    n = int(sys.argv[3]) if len(sys.argv) > 3 else 16
+
+    reader = md.get_reader().get_buffered_reader()
+    reader.move(vt)
+    buf = reader.read(n * 4)
+
+    print(f"vtable @ 0x{vt:08x}")
+    for i in range(n):
+        slot = struct.unpack_from("<I", buf, i*4)[0]
+        print(f"  +0x{i*4:02x} (slot {i:2d}): 0x{slot:08x}")
+
+
+if __name__ == "__main__":
+    main()