Team agents ignore model setting and run on Opus instead of Sonnet

Bug Description

Team agents consistently run on claude-opus-4-6 despite settings.json explicitly configuring claude-sonnet-4-6 as the team model.

Settings Configuration

~/.claude/settings.json:

{
  "teammateMode": "tmux",
  "teams": {
    "size": 10,
    "model": "claude-sonnet-4-6"
  }
}

Expected Behavior

When spawning team agents via TeamCreate + Agent tool with team_name parameter, agents should use the model specified in settings.json → teams.model (i.e., claude-sonnet-4-6).

Actual Behavior

All spawned team agents run on claude-opus-4-6 regardless of the teams.model setting. This has been reproduced across multiple team sessions:

• Deleted and recreated teams
• Verified settings file is correct
• Issue persists consistently

Reproduction Steps

1. Set teams.model to claude-sonnet-4-6 in ~/.claude/settings.json
2. Create a team with TeamCreate
3. Spawn agents with Agent tool using team_name parameter
4. Observe that agents report running on Opus 4.6 instead of Sonnet 4.6

Environment

• Platform: macOS (Darwin 25.2.0)
• Claude Code CLI version: latest
• Main conversation model: claude-opus-4-6