feat: add PyInstaller build for standalone binary distribution

- Add PyInstaller spec file and build script for creating standalone executables
- Add install.sh for curl | sh installation from GitHub releases
- Add GitHub Actions workflow for multi-platform builds (macOS, Linux, Windows)
- Move sandbox-only deps (playwright, ipython, libtmux, etc.) to optional extras
- Make google-cloud-aiplatform optional ([vertex] extra) to reduce binary size
- Use lazy imports in tool actions to avoid loading sandbox deps at startup
- Add -v/--version flag to CLI
- Add website and Discord links to completion message
- Binary size: ~97MB (down from ~120MB with all deps)

strix/interface/main.py

@@ -233,6 +233,15 @@ async def warm_up_llm() -> None:
         sys.exit(1)
 
 
+def get_version() -> str:
+    try:
+        from importlib.metadata import version
+
+        return version("strix-agent")
+    except Exception:  # noqa: BLE001
+        return "unknown"
+
+
 def parse_arguments() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
         description="Strix Multi-Agent Cybersecurity Penetration Testing Tool",
@@ -268,6 +277,13 @@ Examples:
         """,
     )
 
+    parser.add_argument(
+        "-v",
+        "--version",
+        action="version",
+        version=f"strix {get_version()}",
+    )
+
     parser.add_argument(
         "-t",
         "--target",
@@ -428,6 +444,9 @@ def display_completion_message(args: argparse.Namespace, results_path: Path) ->
     console.print("\n")
     console.print(panel)
     console.print()
+    console.print("[dim]🌐 Website:[/] [cyan]https://usestrix.com[/]")
+    console.print("[dim]💬 Discord:[/] [cyan]https://discord.gg/YjKFvEZSdZ[/]")
+    console.print()
 
 
 def pull_docker_image() -> None: