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/package_windows.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Assemble dist/windows-x86_64 from MinGW TUI build + busybox.
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+REL="$ROOT/dist/windows-x86_64"
+EXE="$ROOT/build-win-tui/cst-agent.exe"
+[[ -f "$EXE" ]] || EXE="$ROOT/build-win/cst-agent.exe"
+BB="$ROOT/third_party/busybox/busybox.exe"
+DLL="/usr/x86_64-w64-mingw32/bin/libwinpthread-1.dll"
+
+mkdir -p "$REL"
+cp -f "$EXE" "$REL/cst-agent.exe"
+cp -f "$BB" "$REL/busybox.exe"
+cp -f "$ROOT/third_party/busybox/LICENSE.busybox" "$REL/"
+cp -f "$ROOT/docs/README-windows.md" "$REL/"
+[[ -f "$DLL" ]] && cp -f "$DLL" "$REL/"
+ls -la "$REL"
+file "$REL/cst-agent.exe"