New features
- Added nested FB2 <sequence> support to template metadata.
- .Series template entries now expose .Parent, where -1 means top-level and other values point to the parent index in .Series.
- Nested sequences are flattened in parent-then-child order for template use.
- Updated default title_template to build compact series paths:
- Nested sequences use the first top-level series and its first child chain.
- Flat sequence arrays use all sequence entries.
- The displayed number comes from the last selected sequence.
- Updated template documentation and config comments with .Parent examples.
- Added tests for nested and flat series title-template behavior.
Maintenance
- Moving to go1.26.5 with dependencies update
Full Changelog: v1.5.5...v1.5.6