feat: the pure core for listening and dictation practice (M11, 1/4) - #35

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

call to main actor-isolated instance method 'send' in a synchronous nonisolated context

call to main actor-isolated instance method 'send' in a synchronous nonisolated context

call to main actor-isolated instance method 'send' in a synchronous nonisolated context

call to main actor-isolated instance method 'send' in a synchronous nonisolated context

call to main actor-isolated instance method 'send' in a synchronous nonisolated context

call to main actor-isolated instance method 'send' in a synchronous nonisolated context