- Implement user-global paths (~/.sisyphus/teams/, ~/.sisyphus/tasks/)
- Reuse sanitizePathSegment for team name sanitization
- Cross-platform home directory resolution
- Comprehensive test coverage with sanitization tests
Task 2/25 complete
Port team lifecycle, teammate runtime, inbox messaging, and team-scoped task flows into built-in tools so multi-agent coordination works natively without external server dependencies.