Teammate colors: allow changing after start, per-teammate /color, and a more legible blue

Summary

Teammate (agent teams) display colors can't be chosen or changed, and the default blue is hard to read on dark terminals.

Requests

1. Allow changing a teammate's color after it has started. Today the color is fixed at spawn.
2. Per-teammate /color command, e.g. /color wix-qb red, so the user can recolor any teammate.
3. Make the default teammate blue legible. On a dark terminal theme (WSL2 / Windows Terminal), the blue teammate text is very hard to read.

What I tried

• Asked for a named teammate to be shown in red. No setting or tool exists to choose the color.
• Edited color in ~/.claude/teams/<session>/config.json before and immediately after spawning. It had no effect: messages still render blue.
• Shutting the teammate down and respawning it gives blue again, since the first teammate in a session is always blue.
• Red never appears among 60+ local team configs; the only colors seen are blue, green, yellow, purple, orange and pink.

Environment

• Claude Code 2.1.x, WSL2, Windows Terminal, dark theme