feat(dep_ensure): complete Windows bootstrap — dep_ensure + install.ps1 + detection (#27845)

* feat(dep_ensure): complete Windows bootstrap — dep_ensure + install.ps1 + detection

dep_ensure.py gains Windows awareness: PowerShell invocation, platform-
specific browser detection, (path, shell) tuple returns.

install.ps1 gains -Ensure/-PostInstall modes using npm -g --prefix
(aligned with install.sh) and agent-browser install for Chromium.

browser_tool.py gains node/ in candidate dirs for Windows .cmd shims.
Both install scripts bundled in pip wheel.

Tracking: #27826

* fix(install.ps1): 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: remove duplicate install scripts from git

CI already copies scripts/install.{sh,ps1} into hermes_cli/scripts/
during wheel build. No need to commit copies — .gitignore keeps them
out, _find_install_script() falls back to scripts/ for git-clone users.

Tracking: #27826

* fix: address review — remove env_extra, fix ps1 error handling

- Remove unused env_extra parameter from ensure_dependency()
- Invoke-EnsureMode node case now uses Test-Node consistently
- Install-AgentBrowser uses throw instead of exit 1

pyproject.toml

@@ -210,7 +210,7 @@ hermes-acp = "acp_adapter.entry:main"
 py-modules = ["run_agent", "model_tools", "toolsets", "batch_runner", "trajectory_compressor", "toolset_distributions", "cli", "hermes_bootstrap", "hermes_constants", "hermes_state", "hermes_time", "hermes_logging", "utils"]
 
 [tool.setuptools.package-data]
-hermes_cli = ["web_dist/**/*"]
+hermes_cli = ["web_dist/**/*", "tui_dist/**/*", "scripts/install.sh", "scripts/install.ps1"]
 gateway = ["assets/**/*"]
 
 [tool.setuptools.packages.find]