Metin2 game client (P0–P11) + mobile asset pipeline

Networked client on the existing Godot 4.7 + libgr2 renderer:
- net: m2dev wire protocol (libsodium KX + XChaCha20), auth/select/game
  phases, EntityStore world model, ~all GC/CG headers. char create/delete,
  private shop / mall / cube, SHOP_GC_START_EX, guild, party (+ CG_PARTY_SET_STATE),
  quests, dragon soul, refine, safebox, exchange.
- UI: in-game windows migrated 1:1 from the reference uiscript/root .py —
  char status (/stat), inventory+equipment, select-item ([SELECT_ITEM] quest
  token), system-option + game-option + ESC system menu, private-shop 39-grid,
  party info board, shop tabs, atlas, minimap, quickbar, chat, …
- EterGrnLib polish: GR2 material blend/two-sided, LOD crossfade, motion-event
  dispatch, contact shadow, ray-AABB picking, weapon grip pre-transform.

Portable asset IO (A1) — all extension/libgr2/formats/mtproto reads routed
through godot::FileAccess (res:// PCK works on iOS/Android); standalone-lib
*_path() kept for the non-Godot CTests. AssetResolver + PropertyRegistry
switched to a baked index (bake_asset_index.gd) instead of std::filesystem.

Mobile builds: build-{android,ios}.sh, export-android.sh, pack-assets.sh,
gen-debug-keystore.sh. Assets ship as a zip mounted at runtime by
project/asset_pack.gd (adb push now; HTTP download is a drop-in later).

ctest 10/10, 34 GDScript suites, macOS/iOS/Android all build.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013EJxkHiNKS4kybHS3XKyAJ

.gitignore

@@ -1,19 +1,56 @@
+# Metin2 game assets (project/asset_root.gd). Committed to THIS self-hosted
+# private repo for one-clone multi-device builds. Do not publish/redistribute
+# — copyrighted Ymir art. MT_ASSETS env var overrides the location.
+/assets/asset_index.txt      # derived — regen: godot --headless --path project --script bake_asset_index.gd
+
 # build
 /build/
+/build-ios/
+/build-android/
 /cmake-build-*/
 compile_commands.json
 
 # godot
+/assets/**/*.import
+/assets/**/*.uid
 /project/.godot/
 /project/bin/*.dylib
 /project/bin/*.dSYM/
 /project/bin/*.so
 /project/bin/*.dll
 /project/bin/*.wasm
+/project/bin/ios/
+/project/bin/android/
+# Android Gradle build template (~1.2 GB of regenerable Gradle output + Godot
+# .aar). Recreate per machine:
+#   godot --headless --path project --install-android-build-template \
+#     --export-debug Android build/export/mtgodot-poc.apk
+/project/android/
 
 # misc
 .DS_Store
 *.tmp
+*.o
+*.a
 
 # clangd
 /.cache/
+
+# oracle: cross-compiled exe + leaked Granny DLL (size / RAD IP — never commit;
+# oracle/build-wine.sh rebuilds). See oracle/README.md.
+/oracle/oracle.exe
+/oracle/*.dll
+/oracle/*.dylib
+
+# vendored-lib test artifacts
+/test/oracle_dumps/
+/test/*.actual.png
+/build-tools/
+
+# libgr2 tool outputs
+/fuzz-report.json
+/test/m2-numeric.json.tmp
+
+# compare.py render output
+/test/compare-shots/
+/test/compare-report.json