Add "Waiting for Review" state to background job list

Problem

When running background agents / parallel tasks, the job list currently shows:

• working
• waiting for input
• completed
• failed

A finished job flips straight to completed regardless of whether I've actually seen the output. With 3–5 parallel background jobs, I lose track of which results I've reviewed and which are still fresh.

completed currently conflates two distinct states:

1. System-side: the agent produced a result: and stopped working.
2. User-side: I've read and acknowledged the result.

Proposal

Add a new state between completed and "acknowledged":

• working → waiting for review (agent finished, user hasn't opened it) → completed (user has opened / acknowledged the job)

Transition trigger: opening the job's transcript, or an explicit "mark reviewed" action. Sensible default: opening = acknowledging.

Why it matters

• Parallel workflows become tractable — the list becomes a review queue, not just a status log.
• Removes the "did I already look at this one?" tax when returning to the terminal after a break.
• Mirrors patterns from PR review tools (unread → read), email (unread → read), GitHub notifications.

Nice-to-have

• Visual differentiation (bold / dot / color) in the FleetView list.
• Optional: --auto-review flag for jobs where I don't want this state (fully autonomous chains).