Add pkg/agentic for AI-assisted task management:
- API client for core-agentic service
- Task listing, claiming, updating, completion
- Config from .env or ~/.core/agentic.yaml
CLI commands:
- core dev tasks - list available tasks
- core dev task <id> - show/claim task
- core dev task --auto - AI picks highest priority
- core dev task:update <id> - update progress
- core dev task:complete <id> - mark complete
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
