test: add Windows npm global install CI test (reproduces #262) (#293)

* test: add Windows npm global install CI test (reproduces #262)

This test packs the package and installs it globally with npm,
then runs agent-browser --version. This reproduces the issue where
npm-generated shims on Windows try to invoke /bin/sh which doesn't exist.

The bin/agent-browser.js wrapper is added but not yet wired up,
so this commit should fail CI to confirm the issue.

* fix: Windows npm global install and npx support

The shell script wrapper (bin/agent-browser) with #!/bin/sh shebang
causes npm to generate Windows shims that try to invoke /bin/sh,
which doesn't exist on Windows.

This fix uses a hybrid approach:

1. Node.js wrapper (bin/agent-browser.js) as bin entry
   - Makes npx work on all platforms
   - ~100ms overhead (acceptable since npx has its own overhead)

2. postinstall patches bin entries for global installs
   - Windows: Overwrites .cmd/.ps1 shims to invoke .exe directly
   - Mac/Linux: Replaces symlink to point to native binary
   - Zero overhead for `npm i -g agent-browser` users on all platforms

Also fixes PowerShell glob expansion in CI test.

Fixes #262

* fix: Windows npm global install and npx support

The shell script wrapper (bin/agent-browser) with #!/bin/sh shebang
causes npm to generate Windows shims that try to invoke /bin/sh,
which doesn't exist on Windows.

This fix uses a hybrid approach:

1. Node.js wrapper (bin/agent-browser.js) as bin entry
   - Makes npx work on all platforms
   - ~100ms overhead (acceptable since npx has its own overhead)

2. postinstall patches bin entries for global installs
   - Windows: Overwrites .cmd/.ps1 shims to invoke .exe directly
   - Mac/Linux: Replaces symlink to point to native binary
   - Zero overhead for `npm i -g agent-browser` users on all platforms

Also adds cross-platform CI tests for npm global install to catch
regressions on all platforms (Ubuntu, macOS, Windows).

Fixes #262

* test global install

* remove dead code

bin/agent-browser

@@ -1,28 +0,0 @@
-#!/bin/sh
-# agent-browser CLI wrapper
-# Detects OS/arch and runs the appropriate native binary
-
-SCRIPT="$0"
-while [ -L "$SCRIPT" ]; do
-  SCRIPT_DIR="$(cd "$(dirname "$SCRIPT")" && pwd)"
-  SCRIPT="$(readlink "$SCRIPT")"
-  case "$SCRIPT" in /*) ;; *) SCRIPT="$SCRIPT_DIR/$SCRIPT" ;; esac
-done
-SCRIPT_DIR="$(cd "$(dirname "$SCRIPT")" && pwd)"
-
-OS=$(uname -s | tr '[:upper:]' '[:lower:]')
-ARCH=$(uname -m)
-case "$OS" in darwin) OS="darwin" ;; linux) OS="linux" ;; mingw*|msys*|cygwin*) OS="win32" ;; esac
-case "$ARCH" in x86_64|amd64) ARCH="x64" ;; aarch64|arm64) ARCH="arm64" ;; esac
-
-BINARY="$SCRIPT_DIR/agent-browser-${OS}-${ARCH}"
-
-if [ -f "$BINARY" ]; then
-  # Ensure binary is executable (npm tarballs don't preserve execute bit)
-  [ -x "$BINARY" ] || chmod +x "$BINARY" 2>/dev/null
-  exec "$BINARY" "$@"
-fi
-
-echo "Error: No binary found for ${OS}-${ARCH}" >&2
-echo "Run 'npm run build:native' to build for your platform" >&2
-exit 1