Add more true end-to-end integration tests

[JSONbored]

Problem: Only one true end-to-end integration test exists for the whole package — everything else is unit-level with injected fakes. Nothing spawns the real CLI binary and exercises a full real workflow.

Area: AMS / Testing

Proposal: Add a small suite of true end-to-end tests spawning the real CLI for at least the discover, queue, and status/doctor flows.

Deliverables:

• A handful of new true end-to-end tests covering the most-used commands.

[linear-code]

JSO-3529