renderPerplexityResult was pattern-matching content text prefixes
to decide whether to render in error style. This was tightly coupled
to exact message strings in index.ts — a wording change would
silently break the error styling.
Set isError: true in details on every error return path in execute,
and check details.isError in the renderer instead.
PERPLEXITY_USER_AGENT and PERPLEXITY_API_VERSION were duplicated
in auth/login.ts and search/client.ts. Centralise both so updates
only need to happen in one place.
Enforce 0600 permissions after every auth token write so existing files
with broader modes are corrected.
Add a regression test for the permission hardening path and document the
Bun runtime dependency used by the Node/jiti search subprocess path.
Also declare bun in package dependencies and engines.
Ivan Pereira