feat: add install script for single-binary policy

Author: explicitcontextualunderstanding

install.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+# Install container-compose v0.10.1 to /usr/local/bin
+# Usage: sudo ./install.sh
+
+set -e
+
+NEW_BINARY="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/.build/release/container-compose"
+TARGET="/usr/local/bin/container-compose"
+
+echo "Installing container-compose v0.10.1..."
+
+# Check new binary exists
+if [ ! -f "$NEW_BINARY" ]; then
+    echo "Error: Build the binary first with: ./build-release.sh"
+    exit 1
+fi
+
+# Check sudo needed
+if [ ! -w "/usr/local/bin" ] && [ "$EUID" -ne 0 ]; then
+    echo "Error: Run with sudo: sudo ./install.sh"
+    exit 1
+fi
+
+# Install
+cp "$NEW_BINARY" "$TARGET"
+chmod 755 "$TARGET"
+
+echo "✓ Installed: $TARGET"
+echo "  Version: $($TARGET version 2>&1 | head -1)"
+
+# Verify SINGLE binary
+echo ""
+echo "Checking for duplicate binaries..."
+FOUND=$(find /usr/local/bin /opt/homebrew/bin ~/bin ~/.local/bin -name "container-compose" -type f 2>/dev/null | wc -l | tr -d ' ')
+
+if [ "$FOUND" -eq 1 ]; then
+    echo "✓ Only one binary found: $(which container-compose)"
+elif [ "$FOUND" -gt 1 ]; then
+    echo "⚠️  Found $FOUND binaries:"
+    find /usr/local/bin /opt/homebrew/bin ~/bin ~/.local/bin -name "container-compose" -type f 2>/dev/null
+    echo ""
+    echo "Remove extras manually:"
+    echo '  rm ~/bin/container-compose 2>/dev/null || true'
+else
+    echo "✗ Binary not found in expected locations"
+fi