lf 0.4.1

Fixes

• lf upgrade and lf uninstall no longer pass your LANGFUSE_* variables to the programs they start (uv, pipx, the skills CLI), as lf setup already avoided. The follow-up lf setup after an upgrade keeps your environment, because it reads the credentials from it.

Docs

• Releasing instructions follow the repository's pull-request-only main.
• SECURITY.md lists exactly which programs lf starts and which hosts it contacts.
• Exit code 130 (Ctrl-C at a prompt) is documented; the help catalog names every reason lf setup exits 1; the agent install guide marks the one-line installer as macOS and Linux.
• The RFC gains proposal 4: a readable shorthand for the metrics API, which lf metrics prototypes.

Upgrade

lf upgrade