* refactor(bootstrap): consolidate ACP browser bootstrap into install.{sh,ps1}
Delete 687 lines of duplicated browser bootstrap code from
acp_adapter/bootstrap/. All browser installation now routes through
dep_ensure -> install.{sh,ps1} --ensure, using agent-browser install
for Chromium. install.sh gains ensure_browser() with macOS app-bundle
detection and per-distro guidance.
Tracking: #27826
* fix(install.sh): add --ignore-scripts to npm install for camofox
@askjo/camofox-browser has a dependency (impit) whose postinstall
script runs `npx only-allow pnpm`, which fails under npm. Adding
--ignore-scripts avoids the spurious failure without affecting
functionality.
Tracking: #27826
* fix: add explicit return in ensure_browser, narrow exception in entry.py
ensure_browser() now returns 0 explicitly on all success paths.
_run_setup_browser() catches OSError instead of broad Exception,
letting ImportError propagate as a real packaging bug.
d9b6f75c0b