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Box CLI: exit with the reserved codes for a missing (4) or ambiguous (2) box name #2816
Description
Box CLI follow-up from the architecture review of #2811 (T111), condition C1. By the person's ruling of 2026-10-31, this is box CLI work, not NET.
Every min session miss exits 1 today. The reserved exit-code table (gominimal/arch, the box spec's exit codes) gives 4 for "not found" and 2 for a usage error such as an ambiguous name. T111 adds two typed refusals that the binary could map:
BoxNotFound: "no running VM has a box named '' …" → 4AmbiguousBoxName: a name on more than one VM → 2
What to do
- Adopt the exit-code table for
min sessionand the box commands infailure_exit_code(crates/minimal/src/main.rs). Re-export the error types from theminimalcrate so the binary can downcast them. - Apply the codes to every miss, not only these two, so that scripts see one rule.
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