Add full-name output mode for cbox list

Problem

The cbox list command truncates session names to fit a fixed-width table layout, making it impossible to distinguish between similarly-named sandboxes or copy exact session names for use with cbox output, cbox send, or cbox attach. This forces the manager agent to fall back to raw tmux list-sessions commands to get untruncated names, breaking the abstraction that cbox list is supposed to provide. For workflows managing multiple concurrent sandboxes, this truncation is a consistent source of misrouted commands and wasted recovery cycles.

Context

Possible Solutions

Plan

Implementation Progress

• Add a --full (or equivalent) mode to cbox list that prints untruncated names.
• Keep existing table output as default for human readability.

• Add tests for full-name listing behavior.

• Session names can be copied exactly for cbox output/send/attach without guesswork.

• Default UX remains unchanged unless full mode requested.

• cbox tests pass.

• Source issue: manager workflow needed tmux fallback because list output truncated names.

Review Feedback

• [ ] Review cleared