- Fix template task filtering bug: templates now hidden from all reports
except 'template' and 'all' reports, even when using custom filters
- Add support for status:template filter to explicitly show templates
- Implement comprehensive report system with 12 predefined reports:
* active - Started tasks
* all - All tasks including templates
* completed - Completed tasks
* list - Pending tasks (default)
* minimal - Pending tasks in minimal format
* newest - Most recent pending tasks
* oldest - Oldest pending tasks
* overdue - Overdue tasks
* ready - Tasks ready to work on
* recurring - Pending recurring instances
* template - Recurring template tasks
* waiting - Hidden/waiting tasks
- Replace list command with report-based architecture
- Add configurable default_report option (defaults to 'list')
- Add minimal display format (ID + description only)
- Support flexible syntax: 'opal <report> [filters]' or 'opal [filters] <report>'
- Add 'opal reports' command to list all available reports
