Feature request: switch sessions in `claude agents` with Alt+number shortcuts

Feature Request

When using claude agents to view and switch between sessions/agents, I'd like to jump directly to a session using number keys, e.g. Alt+1, Alt+2, ... (similar to how terminal multiplexers and browsers switch tabs).

Current behavior

Switching between sessions in the claude agents view requires navigating with arrow keys (or j/k) and pressing Enter to select.

Desired behavior

• Each session in the list shows an index number (1–9)
• Pressing Alt+<number> (or a configurable modifier) instantly switches to that session
• Ideally configurable via ~/.claude/keybindings.json

Why

When running many parallel sessions/background agents, switching is a frequent operation. Direct numeric access would make multi-session workflows much faster, matching muscle memory from tmux (prefix+<n>), iTerm2 (Cmd+<n>), and browser tabs.

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