Strengthen TEAM.md prompt with WRONG/CORRECT examples and NEVER wording
to stop models from calling `team_tasks create` before `spawn` in V2.
Prompt changes:
- V2 leads: explicit WRONG/CORRECT pattern, NEVER create before spawn
- V1 leads: separate workflow with manual create→spawn instructions
- team_tasks summary: de-emphasize "create", highlight auto-creation
- spawn team_task_id: clarify "omit to auto-create (recommended)"
Backend guards:
- Reject spawn with in-progress team_task_id (prevents reuse)
- Log warning on early claim race instead of silently ignoring
viettranx
08823c057e