Add build script

README.md

@@ -1,7 +1,7 @@
 **Background Vision Agent (Windows)**
 
 - One-command setup/run: `powershell -ExecutionPolicy Bypass -File .\run.ps1`
-- Requires Python 3.9+. Configure your API key in `bg_agent/config.py` or via the `OPENAI_API_KEY` env var.
+- Requires Python 3.11+ for source-based run. Configure your API key in `bg_agent/config.py` or via the `OPENAI_API_KEY` env var.
 - Runs hidden (uses `pythonw.exe`) and listens for global hotkeys.
 
 **Hotkeys**
@@ -44,4 +44,30 @@
 
 - Before hosting, open `bootstrap-old.ps1` if you need customization (`$RepoUrl`, `$ZipUrl`, etc.). The `bootstrap.ps1` uses the default ZIP URL and destination directory and is designed specifically for `iwr ... | iex` usage.
 
-- bootstrap-old will probably will be removed in the future
+- bootstrap-old will probably will be removed in the future
+
+**Run Without Python (Binary Fallback)**
+
+- The bootstrap now prefers a prebuilt EXE when requested or when Python is missing.
+- Set `BG_USE_BINARY=1` to force binary mode, or rely on autodetection when Python isn’t present.
+- By default it downloads from:
+  `https://git.meoww.cc/admin/openai-code-script-poc/raw/branch/master/bin/BgVisionAgent.exe`
+- Override with `BG_BINARY_URL` to point to your own hosting.
+
+Example:
+```
+$env:BG_USE_BINARY = '1'
+iwr -useb https://git.meoww.cc/admin/openai-code-script-poc/raw/branch/master/bootstrap.ps1 | iex
+```
+
+Note: Some global hotkey features (keyboard hook) might require running the EXE as Administrator.
+
+**Build Your Own EXE (Windows)**
+
+- Requirements: Windows, Python 3.11 or 3.12, PowerShell.
+- Command:
+```
+powershell -ExecutionPolicy Bypass -File scripts\build-win.ps1
+```
+- Output: `dist\BgVisionAgent.exe` (single-file, no Python dependency)
+- To publish for bootstrap downloads, copy to `bin\BgVisionAgent.exe` in this repo (or upload elsewhere and set `BG_BINARY_URL`).