v0.5.0

Two-tier help (#12)

tabbrew --help is now a lean, user-facing summary — commands + the two global options. The full reference (per-command flags, the ENVIRONMENT override table, the tools repo-info demo, and the credentials path) moved behind a developer mode:

tabbrew help --all      # or: tabbrew --help --all

Everything that used to be in --help is still available under --all; nothing was removed.

Update: tabbrew update