Teammates now keep their spawn details and ignore background and cwd overrides

What

A teammate is a helper agent that Claude Code starts to work alongside the main session. Teammates now remember how they were started and hold on to those settings.

• Spawn record: teammates now store a spawnedWith object holding the description, agentType and parentAgentId they were started with.
• Spawn results: agent.spawn results now include a teammateId.
• Listing: in-process teammates are listed with their agent type, description and parent instead of a generic "teammate".
• Fixed settings: a teammate's background and cwd (its working folder) are forced back to the values it was spawned with. Claude Code says the override "does not apply to a teammate", or "do not apply to a teammate" when both are overridden.
• Addressing: a message to an @-address that matches no teammate now gets "no live teammate of this session has the address".
• isTeammate is added to the list of fields recorded with parentAgentId and provider.

Why

A teammate can no longer be moved out of its working folder or its foreground or background mode through tool arguments. Its records now say how it was started, which makes it easier to find and message the right teammate.