Initial CST-Agent: portable Linux/Termux/Windows coding agent.

Vendored sashidown, OpenAI-compatible env (OPENAI_*), and bootstrap scripts.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/bootstrap_linux.sh

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+#!/usr/bin/env bash
+# One-shot: clone (optional) + build CST-Agent on Linux.
+set -euo pipefail
+
+REPO_URL="${CST_AGENT_REPO:-https://git.whcself.xyz/WHC/CST-agent.git}"
+DIR="${1:-}"
+
+if [[ -z "$DIR" ]]; then
+  if [[ -f Makefile && -d src ]]; then
+    DIR="$(pwd)"
+  else
+    DIR="CST-agent"
+  fi
+fi
+
+if [[ ! -f "$DIR/Makefile" ]]; then
+  echo "==> git clone $REPO_URL -> $DIR"
+  git clone "$REPO_URL" "$DIR"
+fi
+cd "$DIR"
+
+echo "==> deps hint: gcc/clang make cmake libcurl ncursesw (zenity optional)"
+if command -v pacman >/dev/null 2>&1; then
+  echo "    Arch: sudo pacman -S --needed base-devel cmake curl ncurses"
+elif command -v apt-get >/dev/null 2>&1; then
+  echo "    Debian: sudo apt install build-essential cmake libcurl4-openssl-dev libncurses-dev"
+fi
+
+echo "==> make"
+make -j"$(nproc 2>/dev/null || echo 4)"
+make check || true
+
+echo
+echo "OK: ./cst-agent"
+echo "OpenAI-compatible env (see docs/env_openai.md):"
+echo "  export OPENAI_API_KEY=sk-..."
+echo "  export OPENAI_BASE_URL=https://api.openai.com/v1"
+echo "  export OPENAI_MODEL=gpt-4.1-mini"
+echo "  ./cst-agent --workspace ."
+echo "Or MiniMax default: export CST_API_KEY=... && ./cst-agent --workspace ."