ci: fix the two downstream jobs (global-install npm pack, windows-integration open)

These jobs ran for the first time once the Windows matrix hang was fixed:

- Global Install: `npm pack` runs the `prepare` script (`husky`), but husky isn't
  installed in that job (no devDeps) → "husky: not found", exit 127. Guard it:
  `prepare: husky || true` (husky's recommended pattern for envs without devDeps;
  still installs hooks for local dev when husky is present).
- Windows Integration: `agent-browser open` defaults to auto-connect and looked
  for an existing Chrome on a debug port, which a fresh CI runner lacks → "Could
  not connect". A CI smoke test should spawn its own browser: use `--launch`.

.github/workflows/ci.yml

@@ -164,7 +164,10 @@ jobs:
         run: |
           $env:PATH = "$pwd\bin;$env:PATH"
           Write-Host "--- Opening page ---"
-          bin/agent-browser-win32-x64.exe open https://example.com
+          # --launch: spawn a standalone browser. Without it, `open` defaults to
+          # auto-connect and looks for an existing Chrome on a debug port — which
+          # a fresh CI runner doesn't have, so it errors "Could not connect".
+          bin/agent-browser-win32-x64.exe --launch open https://example.com
           if ($LASTEXITCODE -ne 0) { Write-Error "open failed"; exit 1 }
           Write-Host "--- Taking snapshot ---"
           $snapshot = bin/agent-browser-win32-x64.exe snapshot