feat: Implement early termination for the judge in Twenty Sprouts game and enhance event handling

feat: Implement audience-only secret badge for Twenty Sprouts game

Merge remote-tracking branch 'origin/main' into worktree-scenarios

feat: make every scenario arena-grade with a competition contract

feat: Implement well-known typed fields for verdicts in output models

feat: update agent personas and scheduling in YAML configurations; enhance event handling and memory deduplication in core logic

feat(core): add resilient loop and shared blackboard

feat: add the-steeped spy-game scenario (word-pair bluff)

feat: unify model catalogue and self-hosted routing

feat: update model endpoint URLs and enhance documentation with mermaid diagrams

feat: add architecture review and scenario authoring documentation