install-browser is a no-op: always prints 'Browser ... is not installed' for the browser it was told to install

[brunobarrientos]

playwright-cli install-browser <browser> does not install anything and always answers as if it were the "not installed" error, on this machine and for every browser kind.

Reproduced 2026-09-19, macOS 25.5.0 arm64:

$ playwright-cli --version
1.59.0-alpha-1771104257000

$ playwright-cli open --browser=chromium https://example.com
Browser "chromium" is not installed. Run `playwright-cli install-browser chromium` to install

$ playwright-cli install-browser chromium
Browser "chromium" is not installed. Run `playwright-cli install-browser chromium` to install

Observed behaviour:

• install-browser performs no download and exits with the "not installed" message for the browser it was told to install (the message even names chromium when invoked with firefox).
• npx playwright install chromium succeeds and populates the standard cache (~/Library/Caches/ms-playwright/chromium-1243, chromium_headless_shell-1243), but playwright-cli open --browser=chromium still reports "chromium is not installed" — the alpha CLI appears to expect a different registry/revision or a daemon restart that playwright-cli kill-all does not fix.

Expected: install-browser chromium downloads the matching browser build and a subsequent open succeeds.

Workaround used: drive the same flows through the playwright npm package directly (npm i playwright && node script.mjs), which resolves chromium-1243 from the shared cache.