Implement Task 10: dice-tray Web Component with: - Polyhedral die picker (d4-d20, d100) - Deterministic roll() using injected RNG - Rule-pack interpretation for successes/ones/verdict - Event emission on roll completion - Reactive rendering on die type/count change TDD: 3 passing tests (picker render, roll+interpret+verdict, die-type switching) Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>