Hibiki (響き) Svelte-style signals for Ruby

The three primitives from Svelte 5’s runes. Writable state, lazy derived values, and eager effects.

Bare state / derived / effect helpers when you include Hibiki::DSL — or skip it and use the plain classes.

Declare signals with class-level macros and use them as plain attributes. Svelte 5 rune fields, in Ruby.