- `album` no longer required; category format changed to Category:Album:<name>
- New optional `categories` list for additional arbitrary categories
- `wiki.siblings` bill of materials: path+tag required for resolution, label optional
- Post-Pandoc [[TAG]] substitution with four-tier fallback (link+label, link, plain label, plain tag)
- Sibling map built from all published posts in the same run; unresolved siblings degrade gracefully
- SCHEMA.md fully updated; README.md deferred items moved to implemented
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
mikkeli
87874fa935