layout: restructure into src/ tests/ android/ scripts/ tools/

- extension/src/{port,platform,codepage} -> src/; native_render -> src/host
  (+ dxt, shaders/); libgr2 -> src/gr2; extension/third_party -> third_party
- extension/tests -> tests/port, libgr2/tests -> tests/gr2
- android-native -> android (build.sh, push-client.sh moved in)
- script -> scripts; tools/40250 -> tools/server; oracle -> tools/granny-oracle;
  perf tools -> tools/perf
- all build trees under build/ (native, release, android, port-gate)
- xrender:: CMake aliases -> mt::; port-map ledger impl paths rewritten

No code changes. ctest 15/15, port_gate macos+android PASS, port_map check 0 errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/metin2-40250-parity-audit/scripts/port_map.py

@@ -11,7 +11,7 @@ live in `audit/port-map/<unit path>.json`; functions without an entry count as T
   port_map.py show <unit>                    per-function status of one unit
   port_map.py check                          stale hashes, unknown functions, tag mismatches, layout
 
-Layers: `logic` (ported into extension/src/port/<Lib>/<File>, same names as 40250), `python`
+Layers: `logic` (ported into src/port/<Lib>/<File>, same names as 40250), `python`
 (the embedded-Python track: Python binding modules, EterPythonLib window system, ScriptLib and the
 Python root) and `platform` (Direct3D/Granny/Miles/Win32 rendering, audio and OS plumbing, covered
 by adapters). Progress is reported per layer so platform code does not dilute the logic figure.
@@ -35,7 +35,7 @@ STATUSES = ("TODO", "PORTED", "RUN_AS_IS", "ADAPTED", "N_A", "DIVERGENT", "NEEDS
 DONE = {"PORTED", "RUN_AS_IS", "ADAPTED", "N_A"}
 PY_ROOT = "../../Client/Eternexus/root"
 UNIT_DIRS = REFERENCE_DIRS + ("EterBase", "EterPythonLib", "ScriptLib", "SpeedTreeLib", "SphereLib", "EterImageLib")
-PORT_DIR = "extension/src/port"
+PORT_DIR = "src/port"
 LAYERS = ("logic", "python", "platform")
 # EterBase units that wrap Win32 file/OS/UI resources. The rest (tea, lzo, cipher, Random, Stl, Timer, Poly/*)
 # is plain logic and is ported into the mirror; CRC32 and Utils mix pure helpers with Win32 calls and stay here.
@@ -180,7 +180,7 @@ def layer(unit: str) -> str:
 
 
 def port_file(unit: str) -> str:
-    """Expected implementation path stem for a `logic` unit (`extension/src/port/GameLib/ActorInstance`)."""
+    """Expected implementation path stem for a `logic` unit (`src/port/GameLib/ActorInstance`)."""
     return f"{PORT_DIR}/{unit.rsplit('.', 1)[0]}"
 
 
@@ -300,7 +300,7 @@ def cmd_show(repo: Path, units: dict[str, Path], args) -> int:
 
 def scan_tags(repo: Path) -> dict[str, list[str]]:
     tags: dict[str, list[str]] = {}
-    for base, pattern in (("project", "*.gd"), ("extension/src", "*.[ch]*")):
+    for base, pattern in (("src", "*.[ch]*"),):
         for path in (repo / base).rglob(pattern):
             if "/addons/" in path.as_posix():
                 continue