[shawn] feat: add GitHub MCP integration

scripts/setup-github-mcp.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+# One-time setup for the GitHub MCP server (github/github-mcp-server).
+# Downloads the latest pre-built single binary for the current platform from
+# the project's GitHub Releases and installs it at ~/.openswarm/bin/.
+# OpenSwarm's GitHub tool tile spawns that binary directly (stdio transport).
+# Re-running this is safe and is how you upgrade to a newer release.
+
+set -euo pipefail
+
+DEST_DIR="$HOME/.openswarm/bin"
+DEST="$DEST_DIR/github-mcp-server"
+
+TAG="$(curl -fsSL https://api.github.com/repos/github/github-mcp-server/releases/latest \
+  | python3 -c "import json,sys; print(json.load(sys.stdin)['tag_name'])")"
+
+OS="$(uname -s)"
+ARCH="$(uname -m)"
+case "$OS-$ARCH" in
+  Darwin-arm64)            ASSET="github-mcp-server_Darwin_arm64.tar.gz" ;;
+  Darwin-x86_64)           ASSET="github-mcp-server_Darwin_x86_64.tar.gz" ;;
+  Linux-x86_64)            ASSET="github-mcp-server_Linux_x86_64.tar.gz" ;;
+  Linux-aarch64|Linux-arm64) ASSET="github-mcp-server_Linux_arm64.tar.gz" ;;
+  *) echo "error: unsupported platform $OS-$ARCH" >&2; exit 1 ;;
+esac
+
+URL="https://github.com/github/github-mcp-server/releases/download/$TAG/$ASSET"
+TMP="$(mktemp -d)"
+trap 'rm -rf "$TMP"' EXIT
+
+echo "Downloading github-mcp-server $TAG ($OS-$ARCH)..."
+curl -fSL "$URL" -o "$TMP/$ASSET"
+tar -xzf "$TMP/$ASSET" -C "$TMP"
+
+mkdir -p "$DEST_DIR"
+mv -f "$TMP/github-mcp-server" "$DEST"
+chmod +x "$DEST"
+
+echo "Installed: $DEST"
+"$DEST" --version 2>/dev/null || true