parseBrowserAuthInput returns an access-only credential for a bare
__Secure-next-auth.session-token value, which /perplexity-login
--browser accepts but credentialsFromEnvironment rejected because it
required .cookies. Only reject when parsing fails entirely.
The perplexity_search tool no longer prompts for pasted browser
credentials mid-search; /perplexity-login --browser is the single
entry point for that flow. Drop the now-unused promptForBrowserAuth
option and its Cloudflare-challenge fallback from authenticate().
Run Perplexity search and auth requests through pi's Node runtime instead of
shelling out to Bun. Move development and CI commands to npm, add a Node test
build path, and keep OTP auth fail-fast when Set-Cookie headers are not
available.