This commit implements Phase 3b/3c architectural improvements:
### New kugetsu CLI commands:
- `kugetsu status` - Check initialization status (replaces kugetsu-helper check-status)
- `kugetsu delegate <msg>` - Send message to PM agent (new command)
- `kugetsu doctor [--fix]` - Diagnose and fix kugetsu issues
### PM Context Injection:
- kugetsu init now reads ~/.kugetsu/pm-agent.md (if exists) and injects
it into the PM agent session at creation time
- PM context is loaded ONCE at init, not on every delegation
- This improves efficiency - kugetsu-pm content read once, not 10 times
### kugetsu-chat updated:
- Now uses `kugetsu delegate` instead of kugetsu-helper
- Now uses `kugetsu status` instead of kugetsu-helper check-status
- Simplified - no longer depends on kugetsu-helpers
### kugetsu continue:
- Removed strict issue-ref format validation
- Now accepts any session name that is tracked in index.json["issues"]
- Issue-ref format is a guideline, not a hard requirement
### Documentation updated:
- phase3a-setup.md - Updated to reflect new kugetsu commands
- kugetsu-install.sh - Simplified Phase 3a setup instructions
### Breaking changes:
- kugetsu-helpers is no longer required for Phase 3a Chat Agent
- kugetsu-chat skill v3.0 now requires kugetsu CLI with new commands
