Type Alias: InputResolution

InputResolution = { input: ResolvedInput; ok: true; } | { ok: false; result: RunResult; }

The outcome of resolveInput: either the resolved input, or a ready-to-return value-free RunResult carrying the diagnostic + exit code for whatever went wrong. A discriminated union so a command reads if (!r.ok) return r.result; and then works with r.input.