v3.2.0

What's changed

• Clarified that clean-ddd-hexagonal is an opinionated synthesis rather than a single canonical architecture model.
• Added pattern-boundary guidance for DDD, Hexagonal Architecture, Clean Architecture, Onion Architecture, CQRS, and Event Sourcing.
• Added Jeffrey Palermo's Onion Architecture as a primary source and separated primary sources, implementation guides, and supplemental syntheses.
• Marked Herberto Graça's Explicit Architecture material as supplemental/non-canonical.
• Aligned repository/port placement guidance across the top-level skill, layer reference, hexagonal reference, and cheatsheet.