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>

.gitignore

@@ -0,0 +1,61 @@
+# --- credentials & local-only configuration ---
+.env
+*.creds
+bin/launch_*.ps1
+bin/launch_*.cmd
+
+# --- big binaries (the package's pdb is committed deliberately; raw snapshots are not) ---
+artifacts/**/snap_*.txt
+artifacts/**/snap_*.bin
+artifacts/**/dump_*.dmp
+artifacts/**/*.dmp
+artifacts/**/*.etl
+artifacts/**/*.cab
+artifacts/**/*.umdh.stdout
+
+# --- build outputs (when Phase 3/8 land) ---
+build/
+out/
+*.obj
+*.pdb.tmp
+*.exp
+*.lib
+!pdb/acclient.pdb
+# but keep the shipping DLL itself committed
+!dll/leakfix/build/leakfix.dll
+
+# --- big files we don't want in the repo ---
+leakhunt-migration.zip
+tmp_*.txt
+Usersacbot*
+*.log
+artifacts/
+
+# memory dir is not part of the public deliverable; keep local
+memory/
+.claude/
+
+# internal docs — keep local, not in the public repo
+REPORT.md
+HANDOFF.md
+CLAUDE.md
+MANIFEST.md
+READ_ME_FIRST.txt
+--help
+
+# derived acclient.exe variants — copyrighted game binary, do not redistribute
+dll/leakfix/acclient*.exe
+dll/leakfix/dist/acclient*.exe
+dll/leakfix/stable/acclient*.exe
+
+# --- OS / editor junk ---
+Thumbs.db
+desktop.ini
+*.swp
+.vscode/
+.idea/
+
+# --- python / venv junk ---
+__pycache__/
+*.pyc
+.venv/