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

package.json

@@ -11,7 +11,7 @@
     "skills"
   ],
   "bin": {
-    "agent-browser": "./bin/agent-browser"
+    "agent-browser": "./bin/agent-browser.js"
   },
   "scripts": {
     "prepare": "husky",