Complete C# server cutover

server/scripts/linux_compat_checks.sh

@@ -4,37 +4,40 @@ set -Eeuo pipefail
 ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
 cd -- "${ROOT}"
 
-echo "==> Checking start.sh line endings (LF)"
-python3 - <<'PY'
-from pathlib import Path
-data = Path("start.sh").read_bytes()
-if b"\r\n" in data or data.count(b"\r"):
-    raise SystemExit("ERROR: start.sh contains CR/CRLF line endings")
-PY
-
-echo "==> Checking start.sh is executable"
-test -x start.sh
-
-echo "==> bash -n start.sh"
-bash -n start.sh
-
-if command -v shellcheck >/dev/null 2>&1; then
-  echo "==> shellcheck start.sh"
-  shellcheck start.sh
-else
-  echo "WARNING: shellcheck not installed; skipping"
+echo "==> Rejecting Python source/runtime dependencies"
+if find .. -type f -name '*.py' -print -quit | grep -q .; then
+  find .. -type f -name '*.py' -print
+  echo "ERROR: Python source files are not allowed in CO-SERVER." >&2
+  exit 1
+fi
+if find . -maxdepth 1 -type f -name 'requirements*.txt' -print -quit | grep -q .; then
+  find . -maxdepth 1 -type f -name 'requirements*.txt' -print
+  echo "ERROR: Python requirements files are not allowed." >&2
+  exit 1
+fi
+if grep -RInE --exclude-dir=.git --exclude='*.md' --exclude='PORT_TROUBLESHOOTING.txt' '(python3?|\.venv|pip install|consumer_server_cli\.py)' ..; then
+  echo "ERROR: Python runtime references remain in executable/configuration files." >&2
+  exit 1
 fi
 
-echo "==> Creating clean virtual environment"
-rm -rf .venv-ci
-python3 -m venv .venv-ci
-.venv-ci/bin/python -m pip install --upgrade pip
-.venv-ci/bin/python -m pip install -r requirements-server.txt pytest
+echo "==> Checking start.sh line endings"
+if LC_ALL=C grep -n $'\r' start.sh >/dev/null 2>&1; then
+  echo "ERROR: start.sh contains CR/CRLF line endings" >&2
+  exit 1
+fi
 
-echo "==> compileall"
-.venv-ci/bin/python -m compileall -q .
+chmod +x start.sh fix-port.sh
+test -x start.sh
+bash -n start.sh
+bash -n fix-port.sh
 
-echo "==> pytest"
-.venv-ci/bin/python -m pytest -q
+if command -v shellcheck >/dev/null 2>&1; then
+  shellcheck start.sh fix-port.sh
+fi
 
-echo "All Linux compatibility checks passed."
+command -v dotnet >/dev/null 2>&1 || { echo "ERROR: dotnet SDK is required" >&2; exit 1; }
+dotnet --info
+dotnet build CommonwealthOnline.Server.csproj -c Release --nologo
+dotnet run --project tests/CommonwealthOnline.Server.Tests.csproj -c Release --no-restore
+
+echo "All C# Linux compatibility checks passed."