2V2-e.2: Godot consumer of the 3D draw commands, offline screenshot

python_3d_surface.gd turns RenderGame's recorded draws into meshes under a
camera read back from SetPerspective; textures come from the 40250 packs.
GetFarClip and the CMapManager ctor ported verbatim. Until the environment
is ported, lit draws with no light/ambient are shown unshaded (stand-in).
script/python_game_render_test.sh runs system.py login -> select -> game
against port_fake_login_server (or --live via MT_LIVE_*) and screenshots.

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

script/python_game_render_test.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+# 2V2-e: the ported client (system.py in Godot) logs in, enters the game and draws RenderGame's
+# commands; project/python_game_render_test.gd takes the screenshot and writes report.json.
+#
+#   script/python_game_render_test.sh            offline: port_fake_login_server on loopback
+#   script/python_game_render_test.sh --live     live: MT_LIVE_HOST / MT_LIVE_LOGIN / MT_LIVE_PASSWORD
+#                                                (+ MT_LIVE_AUTH_PORT / MT_LIVE_GAME_PORT / MT_LIVE_SLOT)
+#
+# Credentials are only ever read from the caller's environment; nothing here prints them. Do not add
+# `set -x`. Needs a windowed Godot (a headless run draws nothing and skips the screenshot checks).
+# exit: 0 PASS, 1 FAIL, 2 precondition missing.
+set -euo pipefail
+set +x
+
+cd "$(dirname "$0")/.."
+repo="$PWD"
+godot_bin="${GODOT:-godot}"
+output="${MT_RENDER_OUTPUT:-$repo/build/rendering/python-game-$(date +%Y%m%d-%H%M%S)-$$}"
+mkdir -p "$output"
+export MT_RENDER_OUTPUT="$output"
+
+server_pid=""
+cleanup() {
+  if [ -n "$server_pid" ]; then
+    kill -TERM "$server_pid" 2>/dev/null || true
+    wait "$server_pid" 2>/dev/null || true
+  fi
+}
+trap cleanup EXIT
+
+if [ "${1:-}" = "--live" ]; then
+  if [ -z "${MT_LIVE_HOST:-}" ] || [ -z "${MT_LIVE_LOGIN:-}" ] || [ -z "${MT_LIVE_PASSWORD:-}" ]; then
+    echo "python_game_render_test: --live needs MT_LIVE_HOST, MT_LIVE_LOGIN, MT_LIVE_PASSWORD" >&2
+    exit 2
+  fi
+else
+  server="$repo/build/extension/src/port/port_fake_login_server"
+  if [ ! -x "$server" ]; then
+    echo "python_game_render_test: build port_fake_login_server first ($server)" >&2
+    exit 2
+  fi
+  fifo="$output/server.ports"
+  "$server" > "$fifo" 2> "$output/server.log" &
+  server_pid=$!
+  for _ in $(seq 50); do
+    [ -s "$fifo" ] && break
+    sleep 0.1
+  done
+  read -r word auth_port game_port < "$fifo" || true
+  if [ "${word:-}" != "ports" ]; then
+    echo "python_game_render_test: the fake server did not start (see $output/server.log)" >&2
+    exit 2
+  fi
+  export MT_LIVE_HOST=127.0.0.1 MT_LIVE_LOGIN=fakeuser MT_LIVE_PASSWORD=fakepass
+  export MT_LIVE_AUTH_PORT="$auth_port" MT_LIVE_GAME_PORT="$game_port" MT_LIVE_SLOT=0
+fi
+
+status=0
+"$godot_bin" --path "$repo/project" --script res://python_game_render_test.gd > "$output/godot.log" 2>&1 || status=$?
+grep -E "^(ok|FAIL):|python_game_render_test:" "$output/godot.log" || true
+exit "$status"