[FEATURE] experimental `claude agents` management interface: add a central list with fixed positions for session names

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

It's difficult to keep track of sessions in the claude agents management interface. Session names jump between the dynamic completed|working|needs_input lists without an established order. The interface becomes too chaotic to be useful beyond a handful of sessions.

Proposed Solution

Create another section for the agents management interface: A central list.

Specs:

1. Central list with an unchanging/fixed order.
2. Shift+up/down to jump between central list section and dynamic list section.
3. Click-session-to-rename (additional session summaries append to the right of name)
4. Color coding to track changes in session status.
5. Sessions don't disappear from central list when they change status -- instead they appear inactive in the central list and active in a dynamic section.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Interactive mode (TUI)

Use Case Example

N/A

Additional Context

N/A