v2.6.0

• [Enhancement] Add Node#register to allow runtime key-value registration on compiled nodes without going through the static setting DSL. Useful for dynamic registries (e.g. named clusters) where setting names are not known at class-load time.
• [Enhancement] Replace version-gated Warning[:performance] with a Warning.categories-based loop that enables all opt-in Ruby warning categories automatically, picking up new categories (e.g. strict_unused_block in Ruby 3.4+) without future patches.