Add AGENTS.md, dotnet/mise wrapper scripts, migrate yaks to yx

scripts/dotnet.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# Run any dotnet command for this repo.
+#
+# Why a wrapper:
+# - dotnet is installed via mise (see mise.toml, dotnet = "10"); it is NOT on
+#   PATH in agent/sandbox shells, so plain `dotnet` fails with 127.
+# - dotnet SDK 10 fails with "The user's home directory could not be
+#   determined" unless DOTNET_CLI_HOME is set.
+# - The test runner must be invoked from the repo root (the parent directory
+#   of the test project), so we always cd here first.
+#
+# Usage: scripts/dotnet.sh <dotnet command and args>
+#   scripts/dotnet.sh test db-subclass-to-dto.sln
+#   scripts/dotnet.sh build
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+export DOTNET_CLI_HOME="${DOTNET_CLI_HOME:-$HOME/.dotnet-cli}"
+export DOTNET_NOLOGO=1
+export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
+
+if ! command -v mise >/dev/null 2>&1; then
+  echo "error: mise not found on PATH; install mise or put dotnet on PATH" >&2
+  exit 1
+fi
+if [ "$#" -eq 0 ]; then
+  exec mise exec -- dotnet --version
+fi
+exec mise exec -- dotnet "$@"