Development record

The v0.15.1 release review found the brief at .abcd/development/brief/04-surfaces/39-status.md:130 out of step with the shipped code. It says: Exits: exit 0 when the fetch succeeded or no origin; exit 1 when the fetch failed; exit 2 outside a git checkout or with an operand. In the code: internal/surface/cli/status.go also exits 1 when what was fetched could not be read (ReadStatus error) and in a checkout without its local tier (v.NoTier), and `abcd status --help` says so ('exit 1 when it failed, when what it fetched could not be read, or in a checkout without its local tier'). The brief omits both e…